diff --git a/build/Dockerfile b/build/Dockerfile
index 3d18dbd..0888b68 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -33,6 +33,8 @@ EXPOSE 80 443
 
 # default environment variables
 ENV SERVER_NAMES="_"
+ENV HTTP_PORT=80
+ENV HTTPS_PORT=443
 ENV HSTS=FALSE
 ENV TLS13_ONLY=FALSE