diff --git a/src/types/fetch.d.ts b/src/types/fetch.d.ts
index 720f38eefd..211d2df6b2 100644
--- a/src/types/fetch.d.ts
+++ b/src/types/fetch.d.ts
@@ -23,9 +23,9 @@ export declare type TypedInternalResponse<Route, Default> =
         : MiddlewareOf<Route>
       : Default
 
-export declare interface $Fetch<T = unknown, R extends FetchRequest = FetchRequest> {
-  (request: R, opts?: FetchOptions): Promise<TypedInternalResponse<R, T>>
-  raw (request: R, opts?: FetchOptions): Promise<FetchResponse<TypedInternalResponse<R, T>>>
+export declare interface $Fetch<DefaultT = unknown, DefaultR = FetchRequest> {
+  <T = DefaultT, R extends FetchRequest = DefaultR> (request: R, opts?: FetchOptions): Promise<TypedInternalResponse<R, T>>
+  raw<T = DefaultT, R extends FetchRequest = DefaultR> (request: R, opts?: FetchOptions): Promise<FetchResponse<TypedInternalResponse<R, T>>>
 }
 
 declare global {