diff --git a/.github/workflows/stack.yml b/.github/workflows/stack.yml
index 5ccade04a..99aae5671 100644
--- a/.github/workflows/stack.yml
+++ b/.github/workflows/stack.yml
@@ -2,6 +2,7 @@ name: Stack CI
 
 on:
   push:
+  pull_request:
   schedule:
   - cron: "0 0 * * 1"