diff --git a/Dockerfile b/Dockerfile
index d6881fc..1367cae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM jupyter/scipy-notebook
 LABEL Maintainer="Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>"
 LABEL ImageName="registry.gitlab.com/wolutator/registry.gitlab.com/wolutator/"
 
-ENV GATEWAY_URL
+ARG GATEWAY_URL
 
 RUN \
   pip install influxdb && \