diff --git a/kasmweb/core/rfb.js b/kasmweb/core/rfb.js
index 80a62cd..f164f85 100644
--- a/kasmweb/core/rfb.js
+++ b/kasmweb/core/rfb.js
@@ -153,7 +153,6 @@ export default class RFB extends EventTargetMixin {
 
         // Mouse state
         this._mouse_buttonMask = 0;
-        this._mouse_arr = [];
         this._viewportDragging = false;
         this._viewportDragPos = {};
         this._viewportHasMoved = false;