diff --git a/src/viewer.js b/src/viewer.js
index 9be3e7fa..7f47f464 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -835,7 +835,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
         var enabled = this.controls.length,
             i;
         for( i = 0; i < this.controls.length; i++ ){
-            enabled = enabled && this.controls[ i ].isVisibile();
+            enabled = enabled && this.controls[ i ].isVisible();
         }
         return enabled;
     },