diff --git a/Dockerfile b/Dockerfile
index e80cb63..794e886 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM alpine
 
 ARG NV
+ARG VCS_REF
 
 LABEL org.label-schema.vcs-url="https://gitbucket.pgollor.de/docker/test" \
 	org.label-schema.vcs-ref=$VCS_REF \