diff --git a/.github/workflows/auto-clang-format.yml b/.github/workflows/auto-clang-format.yml
index 0da73acd..a6422c14 100644
--- a/.github/workflows/auto-clang-format.yml
+++ b/.github/workflows/auto-clang-format.yml
@@ -7,6 +7,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
+      with:
+        ref: ${{ github.head_ref }}
     - uses: DoozyX/clang-format-lint-action@v0.20
       with:
         source: '.'