diff --git a/index.d.ts b/index.d.ts
index cb3b26e..df4f434 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -63,6 +63,7 @@ declare module 'replicate' {
       auth: string;
       userAgent?: string;
       baseUrl?: string;
+      fetch?: Function;
     });
 
     auth: string;