diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 12f1eec2..b22f4bab 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -18,7 +18,7 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: '3.10'
-        ref: ${{ github.event.pull_request.head.ref }}
+        ref: ${{ github.event.pull_request.head.sha }}
     - name: Lint with flake8 and Reformat with black
       run: |
         make init-lint-and-black