diff --git a/packages/helpers/classes/mail.d.ts b/packages/helpers/classes/mail.d.ts
index ac0ced806..26a5754de 100644
--- a/packages/helpers/classes/mail.d.ts
+++ b/packages/helpers/classes/mail.d.ts
@@ -169,7 +169,7 @@ export interface MailData {
 }
 
 export type MailDataRequired = MailData & (
-    { text: string } | { html: string } | { templateId: string } | { content: MailContent[] & { 0: MailContent } });
+    { text: string } | { html: string } | { templateId: string } | { content: [MailContent, ...MailContent[]][] });
 
 export interface MailJSON {
   from: EmailJSON;