diff --git a/Dockerfile b/Dockerfile
index 3331394..f1a7e55 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ COPY docker/nginx.conf /etc/nginx/nginx.conf
 
 # set timezone and locale
 RUN cp /usr/share/zoneinfo/Europe/Paris /etc/localtime && echo "Europe/Paris" > /etc/timezone
-ENV TZ Europe/Paris
+ENV TZ=Europe/Paris
 
 COPY docker/docker-init.sh /usr/local/bin/
 RUN chmod +x usr/local/bin/docker-init.sh