diff --git a/angular-ui-tree/angular-ui-tree-tests.ts b/angular-ui-tree/angular-ui-tree-tests.ts
index 4e5ef91b9..718fada2c 100644
--- a/angular-ui-tree/angular-ui-tree-tests.ts
+++ b/angular-ui-tree/angular-ui-tree-tests.ts
@@ -78,5 +78,6 @@ var droppedCallback: AngularUITree.IDroppedCallback = (eventInfo: AngularUITree.
 
 var callbacks: AngularUITree.ICallbacks = {
     accept: acceptCallback,
+    dragStart: droppedCallback,
     dropped: droppedCallback
 };
diff --git a/angular-ui-tree/angular-ui-tree.d.ts b/angular-ui-tree/angular-ui-tree.d.ts
index 62c8899fa..cfcb2b108 100644
--- a/angular-ui-tree/angular-ui-tree.d.ts
+++ b/angular-ui-tree/angular-ui-tree.d.ts
@@ -54,6 +54,7 @@ declare module AngularUITree {
 
     interface ICallbacks {
         accept: IAcceptCallback;
+        dragStart: IDroppedCallback;
         dropped: IDroppedCallback;
     }