diff --git a/types/ember__polyfills/ember__polyfills-tests.ts b/types/ember__polyfills/ember__polyfills-tests.ts
index 68a6588a69..533fbd86e4 100644
--- a/types/ember__polyfills/ember__polyfills-tests.ts
+++ b/types/ember__polyfills/ember__polyfills-tests.ts
@@ -11,6 +11,7 @@ import { assign, merge } from '@ember/polyfills';
     assign({ a: 'hello' }, { b: 6 }, { a: true }).a; // $ExpectType boolean
     assign({ a: 'hello' }, '', { a: true }).a; // $ExpectError
     assign({ d: ['gobias industries'] }, { a: 'hello' }, { b: 6 }, { a: true }).d; // $ExpectType string[]
+    assign({}, { a: 0 }, { b: 1 }, { c: 2 }, { d: 3 }).a; // $ExpectType any
 })();
 
 (() => { /* merge */
diff --git a/types/ember__polyfills/index.d.ts b/types/ember__polyfills/index.d.ts
index 3c408229dc..697a6c596b 100644
--- a/types/ember__polyfills/index.d.ts
+++ b/types/ember__polyfills/index.d.ts
@@ -13,6 +13,7 @@ import { Mix, Mix3, Mix4 } from './types';
 export function assign<T extends object, U extends object>(target: T, source: U): Mix<T, U>;
 export function assign<T extends object, U extends object, V extends object>(target: T, source1: U, source2: V): Mix3<T, U, V>;
 export function assign<T extends object, U extends object, V extends object, W extends object>(target: T, source1: U, source2: V, source3: W): Mix4<T, U, V, W>;
+export function assign(target: object, ...sources: object[]): any;
 
 /**
  * Merge the contents of two objects together into the first object.