diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4eb807f..f10a7d3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,6 +4,8 @@ on:
   push:
     branches: [4.x]
     tags: ['*']
+  pull_request:
+    branches: [4.x]
   workflow_dispatch:
 
 env: