diff --git a/.github/workflows/external.ci.linux.yml b/.github/workflows/external.ci.linux.yml
index 14f7c76a..3203489b 100644
--- a/.github/workflows/external.ci.linux.yml
+++ b/.github/workflows/external.ci.linux.yml
@@ -5,6 +5,7 @@ name: Linux
 
 on:
   push:
+  pull_request:
   workflow_dispatch:
 
 concurrency: