diff --git a/scripts/astyle.sh b/scripts/astyle.sh
index 90d9c222474..33e33edf759 100755
--- a/scripts/astyle.sh
+++ b/scripts/astyle.sh
@@ -59,7 +59,7 @@ astyleit() {
 	modified=$1.unify_includes_modified
 	cp "$1" "$modified"
 	scripts/unify_includes.pl "$modified"
-	diff "$f" "$modified" >/dev/null || mv "$modified" "$1"
+	diff "$1" "$modified" >/dev/null || mv "$modified" "$1"
 	rm -f "$modified"
 }