diff --git a/Dockerfile b/Dockerfile
index a0826a6..e84221e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,6 +33,7 @@ RUN cp /app/index.html /novnc/
 
 VOLUME /tmp/.X11-unix
 
-EXPOSE 80
+ENV PUBPORT 80
+EXPOSE $PUBPORT
 
 CMD ["supervisord", "-c", "/app/supervisord.conf"]
\ No newline at end of file
diff --git a/conf.d/websockify.conf b/conf.d/websockify.conf
index 92ad718..3c51dd8 100644
--- a/conf.d/websockify.conf
+++ b/conf.d/websockify.conf
@@ -1,3 +1,3 @@
 [program:websockify]
-command=websockify --web /novnc 80 localhost:5900
+command=websockify --web /novnc %(ENV_PUBPORT)s localhost:5900
 autorestart=true