diff --git a/.github/workflows/ci_ubuntu.yml b/.github/workflows/ci_ubuntu.yml
index ac02381c2..346e5ed03 100644
--- a/.github/workflows/ci_ubuntu.yml
+++ b/.github/workflows/ci_ubuntu.yml
@@ -2,7 +2,7 @@ name: CI-cpp-ubuntu
 
 on: 
   workflow_dispatch: {}
-  pull_request:
+  pull_request: [opened, ready_for_review]
   push:
   release: