diff --git a/Dockerfile b/Dockerfile
index 76a6656..76a754e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ RUN dnf -y update && \
 
 COPY gmail-exporter.py /usr/local/sbin/gmail-exporter
 
-ENV GITHUB_SHA $GITHUB_SHA
+ENV GITHUB_SHA=$GITHUB_SHA
 RUN mkdir /app
 RUN $GITHUB_SHA > /app/VERSION
 WORKDIR /app