diff --git a/evennia/web/webclient/static/webclient/js/evennia.js b/evennia/web/webclient/static/webclient/js/evennia.js
index d406db1453..401c841cb5 100644
--- a/evennia/web/webclient/static/webclient/js/evennia.js
+++ b/evennia/web/webclient/static/webclient/js/evennia.js
@@ -195,7 +195,7 @@ An "emitter" object must have a function
         //     to listen to cmdname events.
         //
         var on = function (cmdname, listener) {
-            if (typeof(listener === 'function')) {
+            if (typeof(listener) === 'function') {
                 listeners[cmdname] = listener;
             };
         };