1 files changed, 3 insertions, 0 deletions
diff --git a/src/client/views/nodes/DataVizBox/HistogramBox.tsx b/src/client/views/nodes/DataVizBox/HistogramBox.tsx
index 00dc2ef46..4488323fe 100644
--- a/src/client/views/nodes/DataVizBox/HistogramBox.tsx
+++ b/src/client/views/nodes/DataVizBox/HistogramBox.tsx
@@ -3,6 +3,7 @@ import { observer } from "mobx-react";
 import * as React from "react";
 import { Doc } from "../../../../fields/Doc";
 import { NumCast } from "../../../../fields/Types";
+import { DragManager } from "../../../util/DragManager";
 import "./HistogramBox.scss";
 
 interface HistogramBoxProps {
@@ -15,6 +16,8 @@ interface HistogramBoxProps {
 
 
 export class HistogramBox extends React.Component<HistogramBoxProps> {
+    private _dropXDispoer?: DragManager.DragDropDisposer;
+    private _dropYDispoer?: DragManager.DragDropDisposer;
 
     private origin = {x: 0.1 * this.width, y: 0.9 * this.height};