diff --git a/packages/artplayer/types/option.d.ts b/packages/artplayer/types/option.d.ts
index 194a0906c..1da3e4e03 100644
--- a/packages/artplayer/types/option.d.ts
+++ b/packages/artplayer/types/option.d.ts
@@ -210,7 +210,7 @@ export type Option = {
     /**
      * Custom video proxy
      */
-    proxy?: null | ((this: Artplayer, art: Artplayer) => HTMLCanvasElement | HTMLVideoElement);
+    proxy?: (this: Artplayer, art: Artplayer) => HTMLCanvasElement | HTMLVideoElement;
 
     /**
      * Custom plugin list