diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0fef0c52..57096b64 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -92,6 +92,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
       - name: Install php-cs-fixer
         run: composer global require friendsofphp/php-cs-fixer
       - name: Run php-cs-fixer