diff --git a/.github/workflows/clang-format-check.yml b/.github/workflows/clang-format-check.yml
index f3e883d6..dbc0c2c9 100644
--- a/.github/workflows/clang-format-check.yml
+++ b/.github/workflows/clang-format-check.yml
@@ -35,6 +35,6 @@ jobs:
     - name: Check Formatting
       shell: bash
       run: |
-        MERGE_BASE=$(git merge-base origin/develop ${{ github.ref }})
+        MERGE_BASE=$(git merge-base origin/develop ${{ github.head_ref || github.ref }})
         echo "Comparing against ${MERGE_BASE}"
         git clang-format-17 --diff --style=file -v ${MERGE_BASE}