diff --git a/meteor/meteor.d.ts b/meteor/meteor.d.ts
index 7f17984e2d..e411947122 100644
--- a/meteor/meteor.d.ts
+++ b/meteor/meteor.d.ts
@@ -686,6 +686,8 @@ declare namespace Mongo {
 		new(hexString?: string): ObjectID;
 	}
 	interface ObjectID {
+		valueOf(): string;
+		getTimestamp(): Date;
 	}
 
 }