diff --git a/taskbar.js b/taskbar.js
index b80e4aa..7565aa8 100644
--- a/taskbar.js
+++ b/taskbar.js
@@ -624,7 +624,7 @@ export var Taskbar = class {
     }
 
     _onDragMotion(dragEvent) {
-        let app = Dash.getAppFromSource(dragEvent.source);
+        let app = Dash.Dash.getAppFromSource(dragEvent.source);
         if (app == null)
             return DND.DragMotionResult.CONTINUE;