diff --git a/iptables.spec b/iptables.spec
index 888eb0e..5446ecf 100644
--- a/iptables.spec
+++ b/iptables.spec
@@ -178,7 +178,7 @@ update-alternatives \
 	--slave "%_sbindir/ip6tables-restore" ip6tables-restore "%_sbindir/xtables-legacy-multi" \
 	--slave "%_sbindir/ip6tables-save" ip6tables-save "%_sbindir/xtables-legacy-multi"
 
-%postun
+%preun
 if test "$1" = 0; then
 	update-alternatives --remove iptables "%_sbindir/xtables-legacy-multi"
 fi
@@ -198,7 +198,7 @@ update-alternatives --install "%_sbindir/ebtables" ebtables "%_sbindir/xtables-n
 	--slave "%_sbindir/ebtables-restore" ebtables-restore "%_sbindir/xtables-nft-multi" \
 	--slave "%_sbindir/ebtables-save" ebtables-save "%_sbindir/xtables-nft-multi"
 
-%postun backend-nft
+%preun backend-nft
 if test "$1" = 0; then
 	update-alternatives --remove iptables "%_sbindir/xtables-nft-multi"
 	update-alternatives --remove arptables "%_sbindir/xtables-nft-multi"