diff --git a/postinstall b/postinstall
index 0751cdd..d50be63 100755
--- a/postinstall
+++ b/postinstall
@@ -487,7 +487,7 @@ EOF
 }
 
 create_swap_pool(){
-    if ! pvesm status | grep swap; then
+    if ! pvesm status | grep swap > /dev/null; then
         if ! zfs list rpool/swap > /dev/null 2>&1 ; then
             zfs create -o com.sun:auto-snapshot=false rpool/swap
         else