diff --git a/Dockerfile b/Dockerfile
index 0e6d86d..cf03b06 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 ARG BASE_IMAGE=debian:bullseye
 FROM ${BASE_IMAGE}
 
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get -y update && \
     apt-get -y install --no-install-recommends \