diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f402734d..b09cfd10 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,6 +1,9 @@
 name: build
 
 on:
+  pull_request:
+    branches:
+      - master
   push:
     branches:
       - master