diff --git a/.github/workflows/merge-check.yml b/.github/workflows/merge-check.yml
index 6694d94d92..fb45e3775c 100644
--- a/.github/workflows/merge-check.yml
+++ b/.github/workflows/merge-check.yml
@@ -28,6 +28,7 @@ jobs:
           git fetch origin master:master
           git checkout master
           if [[ "${{ github.event_name }}" == "pull_request"* ]]; then
+            git fetch origin pull/${{ github.event.pull_request.number }}/head
             git merge --ff-only ${{ github.event.pull_request.head.sha }}
           else
             git merge --ff-only ${{ github.sha }}