diff --git a/Dockerfile b/Dockerfile
index ed2d94a..3d93b00 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ FROM alpine:3.19 AS rootfs-stage
 # environment
 ENV ROOTFS=/root-out
 ENV REL=v3.20
-ENV ARCH=x86_64
+ARG ARCH=x86_64
 ENV MIRROR=http://dl-cdn.alpinelinux.org/alpine
 ENV PACKAGES=alpine-baselayout,\
 alpine-keys,\