diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 09b7c2e7..36ad741d 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -43,7 +43,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
       with:
-        ref: ${{ github.event.inputs.fastcdr-branch  || github.ref || matrix.supported-branches }}
+        ref: ${{ github.event.inputs.fastcdr-branch  || ((github.event_name == 'pull_request') && github.ref) || matrix.supported-branches }}
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL