diff --git a/Dockerfile b/Dockerfile
index 1f21f3c..66f5d48 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,8 @@
 ############################################################
 FROM debian:buster-slim
 
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
+ENV http_proxy=http://acng.grote.lan:9999
 
 # hadolint ignore=DL3008,DL3028
 RUN apt-get update && \