diff --git a/docker/Dockerfile b/docker/Dockerfile
index 67a54078f7e557c7eaf041982b7dd3acfdd7c50f..855154e838b7b1091a9cdb32c59b887030b6bb43 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -14,11 +14,12 @@
 # limitations under the License.
 
 ARG BASE_IMAGE=ubuntu:focal
-ARG DEBIAN_FRONTEND=noninteractive
-
 FROM $BASE_IMAGE
 
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && \
+        DEBIAN_FRONTEND="noninteractive" \
+        TZ="Europe/Zurich" \
+        apt-get install -y \
         clang-format \
         cmake \
         g++ \