diff --git a/core/rfb.js b/core/rfb.js
index 4a8483fd..d2c7350b 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -134,7 +134,6 @@ export default class RFB extends EventTargetMixin {
 
         // Mouse state
         this._mouse_buttonMask = 0;
-        this._mouse_arr = [];
         this._viewportDragging = false;
         this._viewportDragPos = {};
         this._viewportHasMoved = false;