diff --git a/src/loaders/AnimationLoader.d.ts b/src/loaders/AnimationLoader.d.ts
index b657037e5a4cca6b075c2ce2676bc6550ae5178d..ccf51e6493fdf42ddd7232fa5c205a55381551b8 100644
--- a/src/loaders/AnimationLoader.d.ts
+++ b/src/loaders/AnimationLoader.d.ts
@@ -8,10 +8,10 @@ export class AnimationLoader extends Loader {
 
 	load(
 		url: string,
-		onLoad?: ( response: string | ArrayBuffer ) => void,
+		onLoad: ( response: AnimationClip[] ) => void,
 		onProgress?: ( request: ProgressEvent ) => void,
 		onError?: ( event: ErrorEvent ) => void
-	): any;
+	): void;
 	parse( json: any ): AnimationClip[];
 
 }
diff --git a/src/loaders/AudioLoader.d.ts b/src/loaders/AudioLoader.d.ts
index d477b0f1b862f5f7cba5d49445035f1a77d05211..c5c5b05d6b6dc036558b57ad180782f889547a8e 100644
--- a/src/loaders/AudioLoader.d.ts
+++ b/src/loaders/AudioLoader.d.ts
@@ -7,9 +7,9 @@ export class AudioLoader extends Loader {
 
 	load(
 		url: string,
-		onLoad: Function,
-		onPrgress: Function,
-		onError: Function
+		onLoad: ( audioBuffer: AudioBuffer ) => void,
+		onProgress?: ( request: ProgressEvent ) => void,
+		onError?: ( event: ErrorEvent ) => void
 	): void;
 
 }
diff --git a/src/loaders/BufferGeometryLoader.d.ts b/src/loaders/BufferGeometryLoader.d.ts
index ffdde0ff9aca85da693b1a85390d564a772571dd..96569ad921a8875d219e2f8e2cbcad7001f79534 100644
--- a/src/loaders/BufferGeometryLoader.d.ts
+++ b/src/loaders/BufferGeometryLoader.d.ts
@@ -1,6 +1,7 @@
 import { Loader } from './Loader';
 import { LoadingManager } from './LoadingManager';
 import { BufferGeometry } from './../core/BufferGeometry';
+import { InstancedBufferGeometry } from '../core/InstancedBufferGeometry';
 
 export class BufferGeometryLoader extends Loader {
 
@@ -8,10 +9,10 @@ export class BufferGeometryLoader extends Loader {
 
 	load(
 		url: string,
-		onLoad: ( bufferGeometry: BufferGeometry ) => void,
-		onProgress?: ( event: any ) => void,
-		onError?: ( event: any ) => void
+		onLoad: ( bufferGeometry: InstancedBufferGeometry | BufferGeometry ) => void,
+		onProgress?: ( request: ProgressEvent ) => void,
+		onError?: ( event: ErrorEvent ) => void
 	): void;
-	parse( json: any ): BufferGeometry;
+	parse( json: any ): InstancedBufferGeometry | BufferGeometry;
 
 }
diff --git a/src/loaders/ImageBitmapLoader.d.ts b/src/loaders/ImageBitmapLoader.d.ts
index a8a2937047ccac2b56be96b3daee228269d07398..70a7f5183ba60c4f7ac2c89a111278c6f85fd226 100644
--- a/src/loaders/ImageBitmapLoader.d.ts
+++ b/src/loaders/ImageBitmapLoader.d.ts
@@ -10,7 +10,7 @@ export class ImageBitmapLoader extends Loader {
 	setOptions( options: object ): ImageBitmapLoader;
 	load(
 		url: string,
-		onLoad?: ( response: string | ArrayBuffer ) => void,
+		onLoad?: ( response: ImageBitmap ) => void,
 		onProgress?: ( request: ProgressEvent ) => void,
 		onError?: ( event: ErrorEvent ) => void
 	): any;