diff --git a/types/throttleit/index.d.ts b/types/throttleit/index.d.ts
index fd0c20f2d1..62f3786708 100644
--- a/types/throttleit/index.d.ts
+++ b/types/throttleit/index.d.ts
@@ -4,7 +4,7 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
-type AnyFunction<R = any> = (...args: any[]) => R;
+type AnyFunction = (...args: any[]) => any;
 
 /**
  * Returns a new function that, when invoked, invokes `func` at most once per `wait` milliseconds.
@@ -13,6 +13,9 @@ type AnyFunction<R = any> = (...args: any[]) => R;
  * @param wait Number of milliseconds that must elapse between `func` invocations.
  * @return A new function that wraps the `func` function passed in.
  */
-declare function throttle<GFunction extends AnyFunction>(fn: GFunction, wait: number): GFunction;
+declare function throttle<GFunction extends AnyFunction>(
+    fn: GFunction,
+    wait: number,
+): GFunction;
 
 export = throttle;