diff --git a/.github/workflows/windows-ci.yml b/.github/workflows/windows-ci.yml
index 0a04054f6..5fd79124b 100644
--- a/.github/workflows/windows-ci.yml
+++ b/.github/workflows/windows-ci.yml
@@ -10,7 +10,7 @@
 name: Windows-CI
 
 # Only run the Windows CI manually since it takes much longer than the others.
-on: workflow_dispatch
+on: [workflow_dispatch, pull_request]
 
 jobs:
   POSIX: