diff --git a/type-definitions/Immutable.d.ts b/type-definitions/Immutable.d.ts
index 9a66449a1a..88976ad83b 100644
--- a/type-definitions/Immutable.d.ts
+++ b/type-definitions/Immutable.d.ts
@@ -2431,7 +2431,8 @@ declare module Immutable {
      * notSetValue will be returned if provided. Note that this scenario would
      * produce an error when using Flow or TypeScript.
      */
-    get<K extends keyof TProps>(key: K, notSetValue: any): TProps[K];
+    get<K extends keyof TProps>(key: K, notSetValue?: any): TProps[K];
+    get<T>(key: string, notSetValue: T): T;
 
     // Reading deep values