diff --git a/src/fxaa.ts b/src/fxaa.ts
index 24d461f..8c693cb 100644
--- a/src/fxaa.ts
+++ b/src/fxaa.ts
@@ -15,7 +15,7 @@ export class FXAASkinViewer extends SkinViewer {
      * Note: FXAA doesn't work well with transparent backgrounds.
      * It's recommended to use an opaque background and set `options.alpha` to false.
      */
-    constructor(options: SkinViewerOptions = {}) {
+    constructor(options?: SkinViewerOptions) {
         super(options);
         this.composer = new EffectComposer(this.renderer);
         this.renderPass = new RenderPass(this.scene, this.camera);
diff --git a/src/viewer.ts b/src/viewer.ts
index 2595050..7fb353d 100644
--- a/src/viewer.ts
+++ b/src/viewer.ts
@@ -3,14 +3,14 @@ import { NearestFilter, PerspectiveCamera, Scene, Texture, Vector2, WebGLRendere
 import { RootAnimation } from "./animation.js";
 import { PlayerObject } from "./model.js";
 
-export type LoadOptions = {
+export interface LoadOptions {
 	/**
 	 * Whether to make the object visible after the texture is loaded. Default is true.
 	 */
 	makeVisible?: boolean;
 }
 
-export type SkinViewerOptions = {
+export interface SkinViewerOptions {
 	width?: number;
 	height?: number;
 	skin?: RemoteImage | TextureSource;