diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 791e8959fddaf9197d8fa91f40b4ba16656c241a..9c06e5290ae60ebefb42e14f6c8e9711c5500e76 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -106,7 +106,8 @@ test:clang:
 docker:build-nightly:
   <<: *docker_template
   only:
-    - schedules
+    variables:
+      - SCHEDULED_NIGHTLY
   script:
     - docker build -t "$IMAGE_TAG_NIGHTLY" .
     - docker run "$IMAGE_TAG_NIGHTLY" /usr/bin/aql2 --help