diff --git a/app.dockerfile b/app.dockerfile
index 105cf86..ab8bfaa 100644
--- a/app.dockerfile
+++ b/app.dockerfile
@@ -2,8 +2,11 @@ FROM node:alpine
 
 ARG NEXT_PUBLIC_WS_URL
 ARG NEXT_PUBLIC_API_URL
+ARG PORT
+
 ENV NEXT_PUBLIC_WS_URL=${NEXT_PUBLIC_WS_URL}
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+ENV PORT=${PORT}
 
 WORKDIR /home/perplexica