diff --git a/.github/workflows/test-s4cmb.yml b/.github/workflows/test-s4cmb.yml
index 319584d..c66a75c 100644
--- a/.github/workflows/test-s4cmb.yml
+++ b/.github/workflows/test-s4cmb.yml
@@ -1,6 +1,6 @@
 name: s4cmb
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build: