diff --git a/object-assign/object-assign.d.ts b/object-assign/object-assign.d.ts
index 52ef486c72..ad797b25ef 100644
--- a/object-assign/object-assign.d.ts
+++ b/object-assign/object-assign.d.ts
@@ -4,6 +4,11 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare module "object-assign" {
+  function objectAssign<T, U>(target: T, source: U): T & U;
+  function objectAssign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
+  function objectAssign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
+  function objectAssign<T, U, V, W, Q>(target: T, source1: U, source2: V, source3: W, source4: Q): T & U & V & W & Q;
+  function objectAssign<T, U, V, W, Q, R>(target: T, source1: U, source2: V, source3: W, source4: Q, source5: T): T & U & V & W & Q & R;
   function objectAssign(target: any, ...sources: any[]): any;
   export = objectAssign;
 }