diff --git a/Dockerfile b/Dockerfile
index ac99b87..15f56b7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 ARG ALPINE_VERSION=3.13.6
 ARG BASE_IMAGE=gitea.nulo.in/sutty/containers-sdk
 ARG EMAIL=monit@sutty.nl
-FROM alpine:${ALPINE_VERSION} as build
+FROM alpine:${ALPINE_VERSION} AS build
 ARG RUBY_VERSION=2.7
 ARG RUBY_PATCH=5
 ENV EMAIL ${EMAIL:-monit@sutty.nl}