diff --git a/entrypoint.sh b/entrypoint.sh
index a505961..4c70052 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -16,5 +16,6 @@ fi
 # echo "NoVNC server started on port $NOVNC_PORT"
 # EXEC=$@
 # exec "$@"
+export LOCALFBPORT=$((5900 + DISPLAY_NUMBER))
 export VGLRUN=vglrun
 chown -R slic3r:slic3r /home/slic3r/ /configs/ /prints/ /dev/stdout && exec gosu slic3r supervisord # -e TRACE
diff --git a/supervisord.conf b/supervisord.conf
index 498fbd5..1695d56 100644
--- a/supervisord.conf
+++ b/supervisord.conf
@@ -10,7 +10,7 @@ redirect_stderr=true
 
 [program:novnc]
 priority=0
-command=websockify --web=/usr/share/novnc/ %(ENV_NOVNC_PORT)s  localhost:5901
+command=websockify --web=/usr/share/novnc/ %(ENV_NOVNC_PORT)s  localhost:%(ENV_LOCALFBPORT)s
 autorestart=true
 redirect_stderr=true