diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 742c31de..0eeef5ed 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,7 +1,10 @@
 # Run tests on master and feature branches.
 name: Test
 
-on: push
+on:
+  pull_request:
+  push:
+    branches: [ main ]
 
 jobs:
   build: