diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f4e544e25..b67021b22 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,7 +2,11 @@ name: build
 
 on:
   push:
+    branches:
+      - master
   pull_request:
+    branches:
+      - master
 
 jobs:
   php-cs: