diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3ae3cce0e1dfffdba46a3c57fb790b1a54b90982..107005f2dcd21a39b9c65823b66fe237ef35d12c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -161,6 +161,7 @@ trigger lecture:
     DUMUX_MERGE_REQUEST_TARGET_BRANCH: $CI_MERGE_REQUEST_TARGET_BRANCH_NAME
     DUMUX_COMMIT_SHA: $CI_COMMIT_SHA
     DUMUX_REFERENCE_SHA: $CI_REFERENCE_SHA
+    DUMUX_DOCKER_CI_BRANCH: $DUMUX_DOCKER_CI_BRANCH
 
 ################################################
 # enable secrets security check                #