diff --git a/Dockerfile b/Dockerfile
index 9f156d3..e7f28b6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.13 AS builder
 
-ARG VERSION ${CI_COMMIT_SHORT_SHA}
+ARG VERSION=${CI_COMMIT_SHORT_SHA}
 
 COPY sink/ /tmp/sink