diff --git a/threejs/three.d.ts b/threejs/three.d.ts
index 993a228c3..826d6332f 100644
--- a/threejs/three.d.ts
+++ b/threejs/three.d.ts
@@ -5672,8 +5672,7 @@ declare module THREE {
     }
 
     export class BoundingBoxHelper extends Mesh {
-        constructor(object: Object3D, hex?: number);
-        constructor();
+        constructor(object?: Object3D, hex?: number);
 
         object: Object3D;
         box: Box3;
@@ -5792,8 +5791,6 @@ declare module THREE {
     export class WireframeHelper extends Line {
         constructor(object: Object3D, hex?: number);
 
-        object: Object3D;
-
     }
 
     // Extras / Objects /////////////////////////////////////////////////////////////////////