diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 761bc48441f..8009269ad5c 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -864,6 +864,7 @@ declare const RegExp: RegExpConstructor;
 interface Error {
     name: string;
     message: string;
+    stack?: string;
 }
 
 interface ErrorConstructor {