diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index af898ebe9..d70a479f8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -343,7 +343,7 @@ gce_ubuntu18-flannel-aio:
   variables:
     <<: *ubuntu18_flannel_aio_variables
     <<: *gce_variables
-  when: on_success
+  when: manual
   except: ['triggers']
   only: [/^pr-.*$/]