diff --git a/src/_internal/types.ts b/src/_internal/types.ts
index 528dae932..7144cd846 100644
--- a/src/_internal/types.ts
+++ b/src/_internal/types.ts
@@ -511,8 +511,8 @@ export type RevalidateCallback = <K extends RevalidateEvent>(
 
 export interface Cache<Data = any> {
   keys(): IterableIterator<string>
-  get(key: string): State<Data> | undefined
-  set(key: string, value: State<Data>): void
+  get<T = Data>(key: string): State<T> | undefined
+  set<T = Data>(key: string, value: State<T>): void
   delete(key: string): void
 }