diff --git a/noveriablcgen b/noveriablcgen
index 726c058..8adcdd6 100755
--- a/noveriablcgen
+++ b/noveriablcgen
@@ -84,7 +84,7 @@ done
 # Files, which won't be deleted
 declare keepfiles=("00_header" "30_uefi-firmware")
 for toDelete in $(ls $grubdir); do
-  if echo ${keepfiles[@]} | grep -q $toDelete; then
+  if ! echo ${keepfiles[@]} | grep -q $toDelete; then
     rm -f $grubdir/$toDelete
   fi
 done