diff --git a/man/man1/Makefile.am b/man/man1/Makefile.am
index cbfbcc0f36..8d7457a3e2 100644
--- a/man/man1/Makefile.am
+++ b/man/man1/Makefile.am
@@ -1,2 +1,12 @@
 dist_man_MANS = zhack.1 ztest.1 raidz_test.1 zvol_wait.1 arcstat.1
 EXTRA_DIST = cstyle.1
+
+if BUILD_LINUX
+# The man pager in most Linux distros defaults to BSD instead of Linux
+# when .Os is blank, but leaving it blank makes things a lot easier on
+# FreeBSD when OpenZFS is vendored in the base system.
+install-data-hook:
+	cd $(DESTDIR)$(mandir)/man1; \
+	$(SED) ${ac_inplace} -e 's/^\.Os$$/.Os Linux/' \
+	    $(dist_man_MANS)
+endif
diff --git a/man/man1/zvol_wait.1 b/man/man1/zvol_wait.1
index 0366da5376..839e1f1447 100644
--- a/man/man1/zvol_wait.1
+++ b/man/man1/zvol_wait.1
@@ -1,6 +1,6 @@
 .Dd July 5, 2019
 .Dt ZVOL_WAIT 1 SMM
-.Os Linux
+.Os
 .Sh NAME
 .Nm zvol_wait
 .Nd Wait for ZFS volume links in
diff --git a/man/man5/Makefile.am b/man/man5/Makefile.am
index 08d04133bf..9cbb2c08f3 100644
--- a/man/man5/Makefile.am
+++ b/man/man5/Makefile.am
@@ -4,3 +4,13 @@ dist_man_MANS = \
 	spl-module-parameters.5 \
 	zfs-module-parameters.5 \
 	zfs-events.5
+
+if BUILD_LINUX
+# The man pager in most Linux distros defaults to BSD instead of Linux
+# when .Os is blank, but leaving it blank makes things a lot easier on
+# FreeBSD when OpenZFS is vendored in the base system.
+install-data-hook:
+	cd $(DESTDIR)$(mandir)/man5; \
+	$(SED) ${ac_inplace} -e 's/^\.Os$$/.Os Linux/' \
+	    $(dist_man_MANS)
+endif
diff --git a/man/man8/Makefile.am b/man/man8/Makefile.am
index 366b4eb510..07f6aefa68 100644
--- a/man/man8/Makefile.am
+++ b/man/man8/Makefile.am
@@ -89,3 +89,13 @@ nodist_man_MANS = \
 	zfs-mount-generator.8
 
 SUBSTFILES += $(nodist_man_MANS)
+
+if BUILD_LINUX
+# The man pager in most Linux distros defaults to BSD instead of Linux
+# when .Os is blank, but leaving it blank makes things a lot easier on
+# FreeBSD when OpenZFS is vendored in the base system.
+install-data-hook:
+	cd $(DESTDIR)$(mandir)/man8; \
+	$(SED) ${ac_inplace} -e 's/^\.Os$$/.Os Linux/' \
+	    $(dist_man_MANS) $(nodist_man_MANS)
+endif
diff --git a/man/man8/zdb.8 b/man/man8/zdb.8
index 56cb02dce7..79e42d29ff 100644
--- a/man/man8/zdb.8
+++ b/man/man8/zdb.8
@@ -17,7 +17,7 @@
 .\"
 .Dd April 14, 2019
 .Dt ZDB 8 SMM
-.Os Linux
+.Os
 .Sh NAME
 .Nm zdb
 .Nd display zpool debugging and consistency information
diff --git a/man/man8/zfs-allow.8 b/man/man8/zfs-allow.8
index 2e1fc98e9c..f32b29a726 100644
--- a/man/man8/zfs-allow.8
+++ b/man/man8/zfs-allow.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-ALLOW 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm allow
 .Nd Delegates ZFS administration permission for the file systems to non-privileged users.
diff --git a/man/man8/zfs-bookmark.8 b/man/man8/zfs-bookmark.8
index c1b48516da..3b2af81592 100644
--- a/man/man8/zfs-bookmark.8
+++ b/man/man8/zfs-bookmark.8
@@ -33,7 +33,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-BOOKMARK 8 SMM
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm bookmark
 .Nd Creates a bookmark of the given snapshot.
diff --git a/man/man8/zfs-clone.8 b/man/man8/zfs-clone.8
index 5daf3bde25..352a2392ff 100644
--- a/man/man8/zfs-clone.8
+++ b/man/man8/zfs-clone.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-CLONE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm clone
 .Nd Creates a clone of the given snapshot.
diff --git a/man/man8/zfs-create.8 b/man/man8/zfs-create.8
index 24ad77d021..c37d63305a 100644
--- a/man/man8/zfs-create.8
+++ b/man/man8/zfs-create.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-CREATE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm create
 .Nd Creates a new ZFS file system.
diff --git a/man/man8/zfs-destroy.8 b/man/man8/zfs-destroy.8
index edd9ee8094..99ae33d5ec 100644
--- a/man/man8/zfs-destroy.8
+++ b/man/man8/zfs-destroy.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-DESTROY 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm destroy
 .Nd Destroys the given dataset(s), snapshot(s), or bookmark.
diff --git a/man/man8/zfs-diff.8 b/man/man8/zfs-diff.8
index e1c19df7d5..bcc12f7cbb 100644
--- a/man/man8/zfs-diff.8
+++ b/man/man8/zfs-diff.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-DIFF 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm diff
 .Nd Display the difference between two snapshots of a given filesystem.
diff --git a/man/man8/zfs-hold.8 b/man/man8/zfs-hold.8
index 200c17ebf2..de30caab15 100644
--- a/man/man8/zfs-hold.8
+++ b/man/man8/zfs-hold.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-HOLD 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm hold
 .Nd Hold a snapshot to prevent it being removed with the zfs destroy command.
diff --git a/man/man8/zfs-list.8 b/man/man8/zfs-list.8
index 54292eb1cb..ad2b57e6d6 100644
--- a/man/man8/zfs-list.8
+++ b/man/man8/zfs-list.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-LIST 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm list
 .Nd Lists the property information for the given datasets in tabular form.
diff --git a/man/man8/zfs-load-key.8 b/man/man8/zfs-load-key.8
index 158f69b0a8..72248b6962 100644
--- a/man/man8/zfs-load-key.8
+++ b/man/man8/zfs-load-key.8
@@ -32,7 +32,7 @@
 .\"
 .Dd January 13, 2020
 .Dt ZFS-LOAD-KEY 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm load-key
 .Nd Load, unload, or change the encryption key used to access a dataset.
diff --git a/man/man8/zfs-mount.8 b/man/man8/zfs-mount.8
index 5e922f84b0..feddafb28e 100644
--- a/man/man8/zfs-mount.8
+++ b/man/man8/zfs-mount.8
@@ -32,7 +32,7 @@
 .\"
 .Dd February 16, 2019
 .Dt ZFS-MOUNT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm mount
 .Nd Manage mount state of ZFS file systems.
diff --git a/man/man8/zfs-project.8 b/man/man8/zfs-project.8
index 3fd7f11e6a..d3171c05c5 100644
--- a/man/man8/zfs-project.8
+++ b/man/man8/zfs-project.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-PROJECT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm project
 .Nd List, set, or clear project ID and/or inherit flag on the file(s) or directories.
diff --git a/man/man8/zfs-promote.8 b/man/man8/zfs-promote.8
index 9e1893f43a..08cd8b2b94 100644
--- a/man/man8/zfs-promote.8
+++ b/man/man8/zfs-promote.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-PROMOTE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm promote
 .Nd Promotes a clone file system to no longer be dependent on its origin snapshot.
diff --git a/man/man8/zfs-receive.8 b/man/man8/zfs-receive.8
index 2d799a2da6..3cd17fea4a 100644
--- a/man/man8/zfs-receive.8
+++ b/man/man8/zfs-receive.8
@@ -32,7 +32,7 @@
 .\"
 .Dd February 16, 2020
 .Dt ZFS-RECEIVE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm receive
 .Nd Creates a snapshot whose contents are as specified in the stream provided on standard input.
diff --git a/man/man8/zfs-rename.8 b/man/man8/zfs-rename.8
index 2725383989..9d650709a0 100644
--- a/man/man8/zfs-rename.8
+++ b/man/man8/zfs-rename.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-RENAME 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm rename
 .Nd Renames the given dataset (filesystem or snapshot).
diff --git a/man/man8/zfs-rollback.8 b/man/man8/zfs-rollback.8
index 2100f595de..1078efd8a4 100644
--- a/man/man8/zfs-rollback.8
+++ b/man/man8/zfs-rollback.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-ROLLBACK 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm rollback
 .Nd Roll back the given dataset to a previous snapshot.
diff --git a/man/man8/zfs-send.8 b/man/man8/zfs-send.8
index c1b2134d11..8b7f940eb7 100644
--- a/man/man8/zfs-send.8
+++ b/man/man8/zfs-send.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-SEND 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm send
 .Nd Generate a send stream, which may be of a filesystem, and may be incremental from a bookmark.
diff --git a/man/man8/zfs-set.8 b/man/man8/zfs-set.8
index f1aeef15d0..5b4348ba94 100644
--- a/man/man8/zfs-set.8
+++ b/man/man8/zfs-set.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-SET 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm set
 .Nd Sets the property or list of properties to the given value(s) for each dataset.
diff --git a/man/man8/zfs-share.8 b/man/man8/zfs-share.8
index 3b0ef791ef..cb01310337 100644
--- a/man/man8/zfs-share.8
+++ b/man/man8/zfs-share.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-SHARE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm share
 .Nd Shares and unshares available ZFS filesystems.
diff --git a/man/man8/zfs-snapshot.8 b/man/man8/zfs-snapshot.8
index b8d8367f80..618d41d22f 100644
--- a/man/man8/zfs-snapshot.8
+++ b/man/man8/zfs-snapshot.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-SNAPSHOT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm snapshot
 .Nd Creates snapshots with the given names.
diff --git a/man/man8/zfs-upgrade.8 b/man/man8/zfs-upgrade.8
index 6cd06e2c92..742d5d7bd9 100644
--- a/man/man8/zfs-upgrade.8
+++ b/man/man8/zfs-upgrade.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-UPGRADE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm upgrade
 .Nd Manage upgrading the on-disk version of filesystems.
diff --git a/man/man8/zfs-userspace.8 b/man/man8/zfs-userspace.8
index 50bca91153..a8477d16a1 100644
--- a/man/man8/zfs-userspace.8
+++ b/man/man8/zfs-userspace.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS-USERSPACE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm userspace
 .Nd Displays space consumed by, and quotas on, each user or group in the specified filesystem or snapshot.
diff --git a/man/man8/zfs-wait.8 b/man/man8/zfs-wait.8
index dcc679bb07..e7e3decb9d 100644
--- a/man/man8/zfs-wait.8
+++ b/man/man8/zfs-wait.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZFS-WAIT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs Ns Pf - Cm wait
 .Nd Wait for background activity to stop in a ZFS filesystem
diff --git a/man/man8/zfs.8 b/man/man8/zfs.8
index 47cf45a99e..92135c986e 100644
--- a/man/man8/zfs.8
+++ b/man/man8/zfs.8
@@ -39,7 +39,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs
 .Nd configures ZFS file systems
diff --git a/man/man8/zfs_ids_to_path.8 b/man/man8/zfs_ids_to_path.8
index d970715997..9d6a4976ef 100644
--- a/man/man8/zfs_ids_to_path.8
+++ b/man/man8/zfs_ids_to_path.8
@@ -22,7 +22,7 @@
 .\" Copyright (c) 2020 by Delphix. All rights reserved.
 .Dd April 17, 2020
 .Dt ZFS_IDS_TO_PATH 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfs_ids_to_path
 .Nd convert objset and object ids to names and paths
diff --git a/man/man8/zfsconcepts.8 b/man/man8/zfsconcepts.8
index 6eeb897b47..8e0e686787 100644
--- a/man/man8/zfsconcepts.8
+++ b/man/man8/zfsconcepts.8
@@ -32,7 +32,7 @@
 .\"
 .Dd June 30, 2019
 .Dt ZFSCONCEPTS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfsconcepts
 .Nd An overview of ZFS concepts.
diff --git a/man/man8/zfsprops.8 b/man/man8/zfsprops.8
index 11ec29832c..a4e2829e3f 100644
--- a/man/man8/zfsprops.8
+++ b/man/man8/zfsprops.8
@@ -40,7 +40,7 @@
 .\"
 .Dd January 30, 2020
 .Dt ZFSPROPS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zfsprops
 .Nd Native properties and user-defined of ZFS datasets.
diff --git a/man/man8/zgenhostid.8 b/man/man8/zgenhostid.8
index 607efe17f8..ff3d2d960b 100644
--- a/man/man8/zgenhostid.8
+++ b/man/man8/zgenhostid.8
@@ -23,7 +23,7 @@
 .\"
 .Dd September 16, 2017
 .Dt ZGENHOSTID 8 SMM
-.Os Linux
+.Os
 .Sh NAME
 .Nm zgenhostid
 .Nd generate and store a hostid in
diff --git a/man/man8/zpool-add.8 b/man/man8/zpool-add.8
index 1fceed5f0d..e8adc353ac 100644
--- a/man/man8/zpool-add.8
+++ b/man/man8/zpool-add.8
@@ -28,7 +28,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-ADD 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm add
 .Nd Adds specified virtual devices to a ZFS storage pool
diff --git a/man/man8/zpool-attach.8 b/man/man8/zpool-attach.8
index 585357b96d..03e04436df 100644
--- a/man/man8/zpool-attach.8
+++ b/man/man8/zpool-attach.8
@@ -29,7 +29,7 @@
 .\"
 .Dd May 15, 2020
 .Dt ZPOOL-ATTACH 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm attach
 .Nd Attach a new device to an existing ZFS virtual device (vdev).
diff --git a/man/man8/zpool-checkpoint.8 b/man/man8/zpool-checkpoint.8
index bcb01d2eb7..df04c88191 100644
--- a/man/man8/zpool-checkpoint.8
+++ b/man/man8/zpool-checkpoint.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-CHECKPOINT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm checkpoint
 .Nd Checkpoints the current state of a ZFS storage pool
diff --git a/man/man8/zpool-clear.8 b/man/man8/zpool-clear.8
index c8d16abb92..ee7a6a2559 100644
--- a/man/man8/zpool-clear.8
+++ b/man/man8/zpool-clear.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-CLEAR 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm clear
 .Nd Clears device errors in a ZFS storage pool.
diff --git a/man/man8/zpool-create.8 b/man/man8/zpool-create.8
index 646c72dcce..0676a67f9f 100644
--- a/man/man8/zpool-create.8
+++ b/man/man8/zpool-create.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-CREATE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm create
 .Nd Creates a new ZFS storage pool
diff --git a/man/man8/zpool-destroy.8 b/man/man8/zpool-destroy.8
index 8f35f9f377..9eace1983e 100644
--- a/man/man8/zpool-destroy.8
+++ b/man/man8/zpool-destroy.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-DESTROY 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm destroy
 .Nd Destroys the given ZFS storage pool, freeing up any devices for other use
diff --git a/man/man8/zpool-detach.8 b/man/man8/zpool-detach.8
index 2cd030c8e7..dab8871cea 100644
--- a/man/man8/zpool-detach.8
+++ b/man/man8/zpool-detach.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-DETACH 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm detach
 .Nd Detaches a device from a ZFS mirror vdev (virtual device)
diff --git a/man/man8/zpool-events.8 b/man/man8/zpool-events.8
index 14886c3ca4..e5887a1d82 100644
--- a/man/man8/zpool-events.8
+++ b/man/man8/zpool-events.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-EVENTS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm events
 .Nd Lists all recent events generated by the ZFS kernel modules
diff --git a/man/man8/zpool-export.8 b/man/man8/zpool-export.8
index 32e36799c6..afe185c98c 100644
--- a/man/man8/zpool-export.8
+++ b/man/man8/zpool-export.8
@@ -29,7 +29,7 @@
 .\"
 .Dd February 16, 2020
 .Dt ZPOOL-EXPORT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm export
 .Nd Exports the given ZFS storage pools from the system
diff --git a/man/man8/zpool-get.8 b/man/man8/zpool-get.8
index 235b7ed6f7..fbe341a8cd 100644
--- a/man/man8/zpool-get.8
+++ b/man/man8/zpool-get.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-GET 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm get
 .Nd Retrieves properties for the specified ZFS storage pool(s)
diff --git a/man/man8/zpool-history.8 b/man/man8/zpool-history.8
index b2ac93c1e8..73fb27449d 100644
--- a/man/man8/zpool-history.8
+++ b/man/man8/zpool-history.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-HISTORY 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm history
 .Nd Displays the command history of the specified ZFS storage pool(s)
diff --git a/man/man8/zpool-import.8 b/man/man8/zpool-import.8
index 3ff0d8ef36..6db5b0a455 100644
--- a/man/man8/zpool-import.8
+++ b/man/man8/zpool-import.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-IMPORT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm import
 .Nd Lists ZFS storage pools available to import or import the specified pools
diff --git a/man/man8/zpool-initialize.8 b/man/man8/zpool-initialize.8
index 95231e3ea8..e8bf656e4b 100644
--- a/man/man8/zpool-initialize.8
+++ b/man/man8/zpool-initialize.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-INITIALIZE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm initialize
 .Nd Write to all unallocated regions of eligible devices in a ZFS storage pool
diff --git a/man/man8/zpool-iostat.8 b/man/man8/zpool-iostat.8
index 52d800329e..c318dcd747 100644
--- a/man/man8/zpool-iostat.8
+++ b/man/man8/zpool-iostat.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-IOSTAT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm iostat
 .Nd Display logical I/O statistics for the given ZFS storage pools/vdevs
diff --git a/man/man8/zpool-labelclear.8 b/man/man8/zpool-labelclear.8
index ef6b92e82c..52c8005614 100644
--- a/man/man8/zpool-labelclear.8
+++ b/man/man8/zpool-labelclear.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-LABELCLEAR 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm labelclear
 .Nd Removes ZFS label information from the specified physical device
diff --git a/man/man8/zpool-list.8 b/man/man8/zpool-list.8
index 8e5c05df31..5e8c6fe5c9 100644
--- a/man/man8/zpool-list.8
+++ b/man/man8/zpool-list.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-LIST 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm list
 .Nd Lists ZFS storage pools along with a health status and space usage
diff --git a/man/man8/zpool-offline.8 b/man/man8/zpool-offline.8
index 70aae190d3..cdcda141f5 100644
--- a/man/man8/zpool-offline.8
+++ b/man/man8/zpool-offline.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-OFFLINE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm offline
 .Nd Take a physical device in a ZFS storage pool offline
diff --git a/man/man8/zpool-reguid.8 b/man/man8/zpool-reguid.8
index 422a82e570..e73f421ade 100644
--- a/man/man8/zpool-reguid.8
+++ b/man/man8/zpool-reguid.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-REGUID 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm reguid
 .Nd Generate a new unique identifier for a ZFS storage pool
diff --git a/man/man8/zpool-remove.8 b/man/man8/zpool-remove.8
index b852368402..055f852fc7 100644
--- a/man/man8/zpool-remove.8
+++ b/man/man8/zpool-remove.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-REMOVE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm remove
 .Nd Remove a device from a ZFS storage pool
diff --git a/man/man8/zpool-reopen.8 b/man/man8/zpool-reopen.8
index 72f9760653..206fedcc57 100644
--- a/man/man8/zpool-reopen.8
+++ b/man/man8/zpool-reopen.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-REOPEN 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm reopen
 .Nd Reopen all virtual devices (vdevs) associated with a ZFS storage pool
diff --git a/man/man8/zpool-replace.8 b/man/man8/zpool-replace.8
index 5e639feaf7..32eaf77c0c 100644
--- a/man/man8/zpool-replace.8
+++ b/man/man8/zpool-replace.8
@@ -29,7 +29,7 @@
 .\"
 .Dd May 15, 2020
 .Dt ZPOOL-REPLACE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm replace
 .Nd Replace one device with another in a ZFS storage pool
diff --git a/man/man8/zpool-resilver.8 b/man/man8/zpool-resilver.8
index 6ef70873fe..a804bea4a3 100644
--- a/man/man8/zpool-resilver.8
+++ b/man/man8/zpool-resilver.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-RESILVER 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm resilver
 .Nd Start a resilver of a device in a ZFS storage pool
diff --git a/man/man8/zpool-scrub.8 b/man/man8/zpool-scrub.8
index 1dfb19f6f4..a562479554 100644
--- a/man/man8/zpool-scrub.8
+++ b/man/man8/zpool-scrub.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-SCRUB 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm scrub
 .Nd Begin a scrub or resume a paused scrub of a ZFS storage pool
diff --git a/man/man8/zpool-split.8 b/man/man8/zpool-split.8
index e3ca6fe9c9..d2943e6e37 100644
--- a/man/man8/zpool-split.8
+++ b/man/man8/zpool-split.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-SPLIT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm split
 .Nd Split devices off a ZFS storage pool creating a new pool
diff --git a/man/man8/zpool-status.8 b/man/man8/zpool-status.8
index 66e3359957..c2fe76c038 100644
--- a/man/man8/zpool-status.8
+++ b/man/man8/zpool-status.8
@@ -29,7 +29,7 @@
 .\"
 .Dd May 15, 2020
 .Dt ZPOOL-STATUS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm status
 .Nd Display detailed health status for the given ZFS storage pools
diff --git a/man/man8/zpool-sync.8 b/man/man8/zpool-sync.8
index e45531b7be..098fdde9e5 100644
--- a/man/man8/zpool-sync.8
+++ b/man/man8/zpool-sync.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-SYNC 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm sync
 .Nd Force data to be written to primary storage of a ZFS storage pool and update reporting data
diff --git a/man/man8/zpool-trim.8 b/man/man8/zpool-trim.8
index 1a887bba5f..eef58aae5d 100644
--- a/man/man8/zpool-trim.8
+++ b/man/man8/zpool-trim.8
@@ -29,7 +29,7 @@
 .\"
 .Dd February 25, 2020
 .Dt ZPOOL-TRIM 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm trim
 .Nd Initiate immediate TRIM operations for all free space in a ZFS storage pool
diff --git a/man/man8/zpool-upgrade.8 b/man/man8/zpool-upgrade.8
index 99fe270cf1..d23d0e0e6d 100644
--- a/man/man8/zpool-upgrade.8
+++ b/man/man8/zpool-upgrade.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL-UPGRADE 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm upgrade
 .Nd Manage version and feature flags of ZFS storage pools
diff --git a/man/man8/zpool-wait.8 b/man/man8/zpool-wait.8
index f035e3e7f1..a3bdba669e 100644
--- a/man/man8/zpool-wait.8
+++ b/man/man8/zpool-wait.8
@@ -29,7 +29,7 @@
 .\"
 .Dd February 25, 2020
 .Dt ZPOOL-WAIT 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool Ns Pf - Cm wait
 .Nd Wait for background activity to stop in a ZFS storage pool
diff --git a/man/man8/zpool.8 b/man/man8/zpool.8
index 505851bc4b..c23fa0591f 100644
--- a/man/man8/zpool.8
+++ b/man/man8/zpool.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOL 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpool
 .Nd configure ZFS storage pools
diff --git a/man/man8/zpoolconcepts.8 b/man/man8/zpoolconcepts.8
index c2fc349710..f9c262f4be 100644
--- a/man/man8/zpoolconcepts.8
+++ b/man/man8/zpoolconcepts.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOLCONCEPTS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpoolconcepts
 .Nd overview of ZFS storage pools
diff --git a/man/man8/zpoolprops.8 b/man/man8/zpoolprops.8
index d85b6d4362..5adbfb3211 100644
--- a/man/man8/zpoolprops.8
+++ b/man/man8/zpoolprops.8
@@ -29,7 +29,7 @@
 .\"
 .Dd August 9, 2019
 .Dt ZPOOLPROPS 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zpoolprops
 .Nd available properties for ZFS storage pools
diff --git a/man/man8/zstream.8 b/man/man8/zstream.8
index f27d08c7b5..6056e097b0 100644
--- a/man/man8/zstream.8
+++ b/man/man8/zstream.8
@@ -22,7 +22,7 @@
 .\" Copyright (c) 2020 by Delphix. All rights reserved.
 .Dd March 25, 2020
 .Dt ZSTREAM 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm zstream
 .Nd manipulate zfs send streams