diff --git a/lib/lib.es5.d.ts b/lib/lib.es5.d.ts
index a9b9f5b0aea2a..ad2dea1f6fdd5 100644
--- a/lib/lib.es5.d.ts
+++ b/lib/lib.es5.d.ts
@@ -1483,7 +1483,7 @@ type Extract<T, U> = T extends U ? T : never;
 /**
  * Construct a type with the properties of T except for those in type K.
  */
-type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;
+type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
 
 /**
  * Exclude null and undefined from T