diff --git a/Dockerfile b/Dockerfile
index a06b146..17e78e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,6 @@ FROM python:3.11
 
 ARG FRONTEND_DIR=munch-ease-frontend
 ARG BACKEND_DIR=munch-ease-backend
-ARG DOOF_PORT=4006
 
 WORKDIR /code
 
@@ -17,6 +16,7 @@ COPY "${FRONTEND_DIR}/dist" /code/app/front-dist
 # Set production flag
 ENV DOOF_PROD=1
 ENV DOOF_DB=/data/doof.sqlite
+ENV DOOF_PORT=4006
 
 EXPOSE 80
 WORKDIR /code/app