diff --git a/types/three/three-core.d.ts b/types/three/three-core.d.ts
index 2487b117b1..ffaa34434f 100644
--- a/types/three/three-core.d.ts
+++ b/types/three/three-core.d.ts
@@ -2251,7 +2251,7 @@ export class MaterialLoader {
     manager: LoadingManager;
     textures: { [key: string]: Texture };
 
-    load(url: string, onLoad: (material: Material) => void): void;
+    load(url: string, onLoad: (material: Material) => void, onProgress?: (event: ProgressEvent) => void, onError?: (event: Error | ErrorEvent) => void): void;
     setTextures(textures: { [key: string]: Texture }): void;
     getTexture(name: string): Texture;
     parse(json: any): Material;