diff --git a/lib/libzutil/os/freebsd/zutil_device_path_os.c b/lib/libzutil/os/freebsd/zutil_device_path_os.c
index 71c9360052..ac4748ec7a 100644
--- a/lib/libzutil/os/freebsd/zutil_device_path_os.c
+++ b/lib/libzutil/os/freebsd/zutil_device_path_os.c
@@ -124,9 +124,9 @@ zpool_label_disk_wait(const char *path, int timeout_ms)
 	return (ENODEV);
 }
 
-/* ARGSUSED */
 boolean_t
 is_mpath_whole_disk(const char *path)
 {
+	(void) path;
 	return (B_FALSE);
 }
diff --git a/lib/libzutil/os/freebsd/zutil_import_os.c b/lib/libzutil/os/freebsd/zutil_import_os.c
index 3da661f4c5..da9a7ded93 100644
--- a/lib/libzutil/os/freebsd/zutil_import_os.c
+++ b/lib/libzutil/os/freebsd/zutil_import_os.c
@@ -243,12 +243,14 @@ zpool_find_import_blkid(libpc_handle_t *hdl, pthread_mutex_t *lock,
 }
 
 int
-zfs_dev_flush(int fd __unused)
+zfs_dev_flush(int fd)
 {
+	(void) fd;
 	return (0);
 }
 
 void
 update_vdevs_config_dev_sysfs_path(nvlist_t *config)
 {
+	(void) config;
 }
diff --git a/lib/libzutil/os/linux/zutil_device_path_os.c b/lib/libzutil/os/linux/zutil_device_path_os.c
index 13f8bd0316..17247233bc 100644
--- a/lib/libzutil/os/linux/zutil_device_path_os.c
+++ b/lib/libzutil/os/linux/zutil_device_path_os.c
@@ -668,10 +668,10 @@ is_mpath_whole_disk(const char *path)
 
 #else /* HAVE_LIBUDEV */
 
-/* ARGSUSED */
 boolean_t
 is_mpath_whole_disk(const char *path)
 {
+	(void) path;
 	return (B_FALSE);
 }
 
diff --git a/lib/libzutil/os/linux/zutil_import_os.c b/lib/libzutil/os/linux/zutil_import_os.c
index ab692401d8..60d3369c9c 100644
--- a/lib/libzutil/os/linux/zutil_import_os.c
+++ b/lib/libzutil/os/linux/zutil_import_os.c
@@ -560,17 +560,17 @@ udev_device_is_ready(struct udev_device *dev)
 
 #else
 
-/* ARGSUSED */
 int
 zfs_device_get_devid(struct udev_device *dev, char *bufptr, size_t buflen)
 {
+	(void) dev, (void) bufptr, (void) buflen;
 	return (ENODATA);
 }
 
-/* ARGSUSED */
 int
 zfs_device_get_physical(struct udev_device *dev, char *bufptr, size_t buflen)
 {
+	(void) dev, (void) bufptr, (void) buflen;
 	return (ENODATA);
 }
 
@@ -788,6 +788,8 @@ update_vdev_config_dev_sysfs_path(nvlist_t *nv, char *path)
 static int
 sysfs_path_pool_vdev_iter_f(void *hdl_data, nvlist_t *nv, void *data)
 {
+	(void) hdl_data, (void) data;
+
 	char *path = NULL;
 	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0)
 		return (1);
diff --git a/lib/libzutil/zutil_import.c b/lib/libzutil/zutil_import.c
index 4d956fdd80..8876e7a7aa 100644
--- a/lib/libzutil/zutil_import.c
+++ b/lib/libzutil/zutil_import.c
@@ -1393,6 +1393,7 @@ static nvlist_t *
 zpool_find_import_impl(libpc_handle_t *hdl, importargs_t *iarg,
     pthread_mutex_t *lock, avl_tree_t *cache)
 {
+	(void) lock;
 	nvlist_t *ret = NULL;
 	pool_list_t pools = { 0 };
 	pool_entry_t *pe, *penext;