diff --git a/Dockerfile b/Dockerfile
index 0b0e97a..d33126c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ LABEL maintainer="thespad"
 
 # environment settings
 ARG UNIFI_BRANCH="stable" \
-DEBIAN_FRONTEND="noninteractive"
+ENV DEBIAN_FRONTEND="noninteractive"
 
 RUN \
   echo "**** install packages ****" && \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index d171bbb..a37d691 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -11,7 +11,7 @@ LABEL maintainer="thespad"
 
 # environment settings
 ARG UNIFI_BRANCH="stable" \
-DEBIAN_FRONTEND="noninteractive"
+ENV DEBIAN_FRONTEND="noninteractive"
 
 RUN \
   echo "**** install packages ****" && \