diff --git a/packages/email/email.d.ts b/packages/email/email.d.ts
index 528079f503..6c78d761d9 100644
--- a/packages/email/email.d.ts
+++ b/packages/email/email.d.ts
@@ -1,5 +1,5 @@
 import { SendMailOptions } from 'nodemailer';
- 
+
 export namespace Email {
   /**
    * ExtraMailOptions is intentionally left empty here, but can be overridden in
@@ -11,7 +11,7 @@ export namespace Email {
   interface ExtraMailOptions {}
   type EmailOptions = { mailComposer: MailComposer } | (ExtraMailOptions & SendMailOptions)
 
-  interface CustomEmailOptions extends EmailOptions {
+  type CustomEmailOptions = EmailOptions & {
     packageSettings?: unknown;
   }