diff --git a/Stable2.0/Dockerfile b/Stable2.0/Dockerfile
index a4916da..1dcfade 100644
--- a/Stable2.0/Dockerfile
+++ b/Stable2.0/Dockerfile
@@ -2,7 +2,7 @@ FROM debian:stable-slim
 LABEL maintainer="gnilebein - <docker@gnilebein.nl>"
 
 # Set apt non-interactive
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
 # Install Rspamd
 RUN set -x \