diff --git a/types/polymer/index.d.ts b/types/polymer/index.d.ts
index 7b7d45d572..c942d26037 100644
--- a/types/polymer/index.d.ts
+++ b/types/polymer/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for polymer v1.1.6
+// Type definitions for polymer v1.2.6
 // Project: https://github.com/Polymer/polymer
 // Definitions by: Louis Grignon <https://github.com/lgrignon>, Suguru Inatomi <https://github.com/laco0416>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -120,7 +120,7 @@ declare global {
 
       notifyPath?(path: string, value: any, fromAbove: any): void;
 
-      set?(path: string|(string|number)[], value: any, root?: Object): void;
+      set?<Value>(path: string|(string|number)[], value: Value, root?: Object): void;
 
       get?(path: string|(string|number)[], root?: Object): any;