diff --git a/gitlab-ci/Dockerfile b/gitlab-ci/Dockerfile
index c830f850e20482b5b3af84a31172d83a2e8c3027..19867a758935f501b558d37c4dcf1317fb9a4d92 100644
--- a/gitlab-ci/Dockerfile
+++ b/gitlab-ci/Dockerfile
@@ -3,6 +3,7 @@ FROM sdvharbor.slub-dresden.de/replication/debian:${DEBIAN_RELEASE}-slim
 
 # Do NOT delete "ARG DEBIAN_RELEASE" line, it's needed because of 
 # https://docs.docker.com/engine/reference/builder/#understand-how-arg-and-from-interact
+ARG DEBIAN_RELEASE
 ARG GITDIR
 ENV DEBIAN_FRONTEND=noninteractive
 ENV EXTDPKG="extdpkg"