diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index b91318e5..9b2211fb 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -23,7 +23,9 @@ jobs:
         run: brew install ldid
 
       - name: Add PR suffix to version
-        run: sed -e "/MARKETING_VERSION = .*/s/\$/-pr.${{ github.event.pull_request.number }}+$(git rev-parse --short HEAD)/" -i '' Build.xcconfig
+        run: sed -e "/MARKETING_VERSION = .*/s/\$/-pr.${{ github.event.pull_request.number }}+$(git rev-parse --short ${COMMIT:-HEAD})/" -i '' Build.xcconfig
+        env:
+          COMMIT: ${{ github.event.pull_request.head.sha }}
 
       - name: Setup Xcode
         uses: maxim-lobanov/setup-xcode@v1.4.1