diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6f2a2d5..73b2393 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,5 +1,5 @@
 name: CI
-on: [push]
+on: [push, pull_request]
 jobs:
   check:
     runs-on: ubuntu-18.04