diff --git a/src/rendering/advanced-rendering.ts b/src/rendering/advanced-rendering.ts
index 1cf1484d..25927b9a 100644
--- a/src/rendering/advanced-rendering.ts
+++ b/src/rendering/advanced-rendering.ts
@@ -82,7 +82,7 @@ class RenderLayerPass extends RenderPass {
     scene: Scene,
     camera: Camera,
     renderLayerMask: number,
-    overrideMaterial: Material | null = null
+    overrideMaterial?: Material
   ) {
     super(scene, camera, overrideMaterial);
     this.renderLayerCamera = camera;