diff --git a/mailcheck/mailcheck.d.ts b/mailcheck/mailcheck.d.ts
index 64b5f93c4..66d90ba0c 100644
--- a/mailcheck/mailcheck.d.ts
+++ b/mailcheck/mailcheck.d.ts
@@ -46,6 +46,7 @@ declare module MailcheckModule {
     }
 
     export interface IOptions {
+        email: string;
         domains?: string[];
         secondLevelDomains?: string[];
         topLevelDomains?: string[];