diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e185c05a..eda13cf2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,7 +1,12 @@
 name: Build and test GAM
 
 on:
-  on: [push, pull_request]
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
   schedule:
     - cron: '37 22 * * *'