diff --git a/lib/util/git/index.ts b/lib/util/git/index.ts
index 16b22575ab43c9528250b0add9b9d377f176efee..81811c059decabd7185487b1806e977404b970de 100644
--- a/lib/util/git/index.ts
+++ b/lib/util/git/index.ts
@@ -897,7 +897,9 @@ export async function hasDiff(
 ): Promise<boolean> {
   await syncGit();
   try {
-    return (await gitRetry(() => git.diff([sourceRef, targetRef]))) !== '';
+    return (
+      (await gitRetry(() => git.diff([sourceRef, targetRef, '--']))) !== ''
+    );
   } catch (err) {
     return true;
   }