diff --git a/types/deep-freeze/index.d.ts b/types/deep-freeze/index.d.ts
index 2e08d1532a..16e183d185 100644
--- a/types/deep-freeze/index.d.ts
+++ b/types/deep-freeze/index.d.ts
@@ -1,6 +1,6 @@
 // Type definitions for deep-freeze 0.1
 // Project: https://github.com/substack/deep-freeze
-// Definitions by: Bart van der Schoor <https://github.com/Bartvds>
+// Definitions by: Bart van der Schoor <https://github.com/Bartvds>, Aluan Haddad <https://github.com/aluanhaddad>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.1
 
@@ -11,5 +11,7 @@ declare function deepFreeze<T extends Function>(f: T): T;
 declare function deepFreeze<T>(o: T): deepFreeze.DeepReadonly<T>;
 
 declare namespace deepFreeze {
-    type DeepReadonly<T> = Readonly<{ [P in keyof T]: DeepReadonly<T[P]> }>;
+    type DeepReadonly<T> = {
+        readonly [P in keyof T]: DeepReadonly<T[P]>
+    };
 }