diff --git a/format_spec_file b/format_spec_file
index 01c0a36..e6da271 100644
--- a/format_spec_file
+++ b/format_spec_file
@@ -26,7 +26,7 @@ for i in *.spec; do
   fi
   /usr/lib/obs/service/format_spec_file.files/prepare_spec "$i" > "$MYOUTDIR/$i" || RETURN=1
   # remove all file files which are indendical to committed files
-  cmp "$i" "$MYOUTDIR/$i" && rm "$MYOUTDIR/$i"
+  cmp -s "$i" "$MYOUTDIR/$i" && rm "$MYOUTDIR/$i"
 done
 
 exit $RETURN