diff --git a/.github/workflows/Check pull request source branch.yml b/.github/workflows/Check pull request source branch.yml
index fb4b2fc..84e10a3 100644
--- a/.github/workflows/Check pull request source branch.yml	
+++ b/.github/workflows/Check pull request source branch.yml	
@@ -8,7 +8,7 @@ on:
       - edited
 jobs:
   check-branches:
-    runs-on: $default-branch
+    runs-on: ubuntu-latest
     steps:
       - name: Check branches
         run: |