diff --git a/modules/Dockerfile b/modules/Dockerfile
index 61573c17..2e77a040 100644
--- a/modules/Dockerfile
+++ b/modules/Dockerfile
@@ -1,5 +1,5 @@
 ARG NGINX_FROM_IMAGE=nginx:mainline
-FROM ${NGINX_FROM_IMAGE} as builder
+FROM ${NGINX_FROM_IMAGE} AS builder
 
 ARG ENABLED_MODULES