diff --git a/lib/call.ts b/lib/call.ts
index 3b919ff3..50cd79c7 100644
--- a/lib/call.ts
+++ b/lib/call.ts
@@ -69,11 +69,12 @@ export function call<T, TArgs extends unknown[] = []>(
   fn: (...args: TArgs) => Promise<T>,
 ): Operation<T>;
 export function call<T, TArgs extends unknown[] = []>(
-  fn: (...args: TArgs) => T,
+  fn: (...args: TArgs) => Operation<T>,
 ): Operation<T>;
 export function call<T, TArgs extends unknown[] = []>(
-  fn: (...args: TArgs) => Operation<T>,
+  fn: (...args: TArgs) => T,
 ): Operation<T>;
+
 export function call<T, TArgs extends unknown[] = []>(
   callable: Callable<T, TArgs>,
   ...args: TArgs