diff --git a/queueing/Dockerfile b/queueing/Dockerfile
index 354b77fe..c37cdea9 100644
--- a/queueing/Dockerfile
+++ b/queueing/Dockerfile
@@ -1,5 +1,5 @@
 # Build Stage
-FROM python:3.9-slim as builder
+FROM python:3.9-slim AS builder
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1