diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6edaf8e..d4de179 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,5 +1,5 @@
 name: build
-on: push
+on: [push pull_request]
 jobs:
   build:
     runs-on: ubuntu-20.04