diff --git a/.github/workflows/code_style.yml b/.github/workflows/code_style.yml
index 620760ae..45a624b8 100644
--- a/.github/workflows/code_style.yml
+++ b/.github/workflows/code_style.yml
@@ -1,6 +1,8 @@
 name: Code Style
 on:
   pull_request:
+    branches:
+      - main
 
 jobs:
   format: