diff --git a/UI/WebServerResources/js/Scheduler/sgDraggableCalendarBlock.directive.js b/UI/WebServerResources/js/Scheduler/sgDraggableCalendarBlock.directive.js
index 31a9080cd..b2d3465b5 100644
--- a/UI/WebServerResources/js/Scheduler/sgDraggableCalendarBlock.directive.js
+++ b/UI/WebServerResources/js/Scheduler/sgDraggableCalendarBlock.directive.js
@@ -81,7 +81,7 @@
       }
 
       function onDragDetect(ev) {
-        var dragMode, pointerHandler, hasVerticalScrollbar, rect;
+        var dragMode, pointerHandler, hasVerticalScrollbar, rect, scrollableZone;
 
         ev.stopPropagation();