diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9c06e5290ae60ebefb42e14f6c8e9711c5500e76..f711bdf52568d8e1097f925ae342f60c2e421d0b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -107,7 +107,7 @@ docker:build-nightly:
   <<: *docker_template
   only:
     variables:
-      - SCHEDULED_NIGHTLY
+      - $SCHEDULED_NIGHTLY
   script:
     - docker build -t "$IMAGE_TAG_NIGHTLY" .
     - docker run "$IMAGE_TAG_NIGHTLY" /usr/bin/aql2 --help