diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 21530ddc4eee505ac6cd113505bb95be789ce797..3e045a5d129094fc01c7044e02db5761045ef04b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -131,6 +131,7 @@ trigger lecture:
   - if: $CI_PIPELINE_SOURCE == "schedule"
   - if: $CI_PIPELINE_SOURCE == "pipeline"
   - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+    when: manual
   stage: trigger dumux pipelines
   trigger:
     project: dumux-repositories/dumux-lecture