diff --git a/app.json b/app.json
index 78cf493..8d3d146 100644
--- a/app.json
+++ b/app.json
@@ -25,7 +25,7 @@
 		"value" : ":0",
         "required" : true
       } ,
-      "NO_VNC PORT" : {
+      "NO_VNC_PORT" : {
         "description": "NoVNC HTTP/HTTPS Port.",
 		"value" : "$PORT",
         "required" : true