diff --git a/.github/workflows/CI_master.yml b/.github/workflows/CI_master.yml
index 453b92af1c..2d8c6dbfb0 100644
--- a/.github/workflows/CI_master.yml
+++ b/.github/workflows/CI_master.yml
@@ -54,21 +54,21 @@ jobs:
 
   Ubuntu:
     needs: [Prepare]
-    if: "!startsWith(github.ref, 'refs/heads/backport-')"
+    if: "!startsWith(github.head_ref, 'refs/heads/backport-')"
     uses: ./.github/workflows/sub_buildUbuntu.yml
     with:
       artifactBasename: Ubuntu-${{ github.run_id }}
 
   Windows:
     needs: [Prepare]
-    if: "!startsWith(github.ref, 'refs/heads/backport-')"
+    if: "!startsWith(github.head_ref, 'refs/heads/backport-')"
     uses: ./.github/workflows/sub_buildWindows.yml
     with:
       artifactBasename: Windows-${{ github.run_id }}
 
   Lint:
     needs: [Prepare]
-    if: "!startsWith(github.ref, 'refs/heads/backport-')"
+    if: "!startsWith(github.head_ref, 'refs/heads/backport-')"
     uses: ./.github/workflows/sub_lint.yml
     with:
       artifactBasename: Lint-${{ github.run_id }}