diff --git a/.github/workflows/test.build.lib.yml b/.github/workflows/test.build.lib.yml
index 00e82f3b..89651384 100644
--- a/.github/workflows/test.build.lib.yml
+++ b/.github/workflows/test.build.lib.yml
@@ -1,6 +1,9 @@
 name: build:lib
 
-on: push
+on:
+  pull_request:
+    branches:
+      - main
 
 jobs:
   files-changed: