diff --git a/Dockerfile b/Dockerfile
index 6a993ba..9c90d30 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,6 +13,7 @@ RUN sed -i '/^rlimit-nproc/s/^\(.*\)/#\1/g' /etc/avahi/avahi-daemon.conf
 RUN sed -i -e 's/# de_DE.UTF-8 UTF-8/de_DE.UTF-8 UTF-8/' /etc/locale.gen && \dpkg-reconfigure --frontend=noninteractive locales && \update-locale LANG=de_DE.UTF-8
 ENV LANG de_DE.UTF-8 
 RUN cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime
+ENV TZ Europe/Berlin
 
 RUN mkdir -p /opt/iobroker/ && chmod 777 /opt/iobroker/
 RUN mkdir -p /opt/scripts/ && chmod 777 /opt/scripts/