diff --git a/.github/workflows/check-branch.yml b/.github/workflows/check-branch.yml
index 61054e1..b1de7b4 100644
--- a/.github/workflows/check-branch.yml
+++ b/.github/workflows/check-branch.yml
@@ -2,7 +2,7 @@ name: 'Check Source Branch'
 on:
   pull_request:
     branches:
-      - main
+      - master
 jobs:
   check-branch:
     runs-on: ubuntu-latest