diff --git a/zfs-modules.spec.in b/zfs-modules.spec.in
index 09956b3abf..9b5e4716d9 100644
--- a/zfs-modules.spec.in
+++ b/zfs-modules.spec.in
@@ -206,7 +206,7 @@ Version:         %{version}
 Release:         %{release}
 License:         @LICENSE@
 URL:             git://eris.llnl.gov/zfs.git
-BuildRoot:       %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id_u} -n)
+BuildRoot:       %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id} -un)
 Source:          @PACKAGE@-%{version}.tar.gz
 Requires:        %{krequires}
 Requires:        %{splrequires}
diff --git a/zfs.spec.in b/zfs.spec.in
index 9419b34a32..87093ea590 100644
--- a/zfs.spec.in
+++ b/zfs.spec.in
@@ -10,7 +10,7 @@ Version:         %{version}
 Release:         %{release}
 License:         CDDL
 URL:             git://eris.llnl.gov/zfs.git
-BuildRoot:       %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id_u} -n)
+BuildRoot:       %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id} -un)
 Source:          %{name}-%{version}.tar.gz
 Requires:        zlib
 BuildRequires:   zlib-devel