diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 3127870..c6be1e5 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -170,11 +170,11 @@ jobs:
         run: |
           PATH="$PWD/sonar-scanner/bin:$PATH"
           if [[ "${{ github.event_name }}" == "pull_request" ]]; then
-            git checkout "${{ github.event.pull_request.head.sha }}"
+            git checkout "${GITHUB_HEAD_REF}"
             sonar-scanner -Dsonar.pullrequest.branch="{{ github.event.pull_request.head.sha }}" -Dsonar.pullrequest.base="{{ github.event.pull_request.base.sha }}" -Dsonar.pullrequest.key="${{ github.event.number }}"
           else
             sonar-scanner
-          fi
+          fi    
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}