diff --git a/.github/workflows/build_lint_test.yaml b/.github/workflows/build_lint_test.yaml
index dd8f07bf..2654bc29 100644
--- a/.github/workflows/build_lint_test.yaml
+++ b/.github/workflows/build_lint_test.yaml
@@ -1,7 +1,9 @@
 name: ytld-sub build, lint, test
 
-on: [pull_request]
-
+on:
+  pull_request:
+    branches:
+      - master
 jobs:
   build:
     runs-on: ubuntu-latest