diff --git a/rpm/generic/zfs-dkms.spec.in b/rpm/generic/zfs-dkms.spec.in
index 568bef988..d87293686 100644
--- a/rpm/generic/zfs-dkms.spec.in
+++ b/rpm/generic/zfs-dkms.spec.in
@@ -73,7 +73,7 @@ exit 1
 
 %preun
 # Are we doing an upgrade?
-if [ $1 -ne 0 ] ; then
+if [ "$1" = "1" -o "$1" = "upgrade" ] ; then
 	# Yes we are.  Are we upgrading to a new ZFS version?
 	NEWEST_VER=$(dkms status zfs | sed 's/,//g' | sort -r -V | awk '/installed/{print $2; exit}')
 	if [ "$NEWEST_VER" != "%{version}" ] ; then