diff --git a/.github/workflows/quick-test.yml b/.github/workflows/quick-test.yml
index 1a32bbfe31..8a7b24033f 100644
--- a/.github/workflows/quick-test.yml
+++ b/.github/workflows/quick-test.yml
@@ -38,3 +38,5 @@ jobs:
       run: ruff check --output-format github .
     - name: Run autopep8
       run: autopep8 --diff .
+    - name: Check file mode
+      run: git ls-files --format="%(objectmode) %(path)" yt_dlp/ | ( ! grep -v "^100644" )
diff --git a/yt_dlp/extractor/vk.py b/yt_dlp/extractor/vk.py
old mode 100755
new mode 100644