diff --git a/nginx-flask-mysql/backend/Dockerfile b/nginx-flask-mysql/backend/Dockerfile
index b1a3e56..c2ef501 100755
--- a/nginx-flask-mysql/backend/Dockerfile
+++ b/nginx-flask-mysql/backend/Dockerfile
@@ -17,7 +17,7 @@ EXPOSE 8000
 
 CMD ["flask", "run"]
 
-FROM builder as dev-envs
+FROM builder AS dev-envs
 
 RUN <<EOF
 apk update