diff --git a/types/nodemailer/lib/json-transport.d.ts b/types/nodemailer/lib/json-transport.d.ts
index f6792f4402..239decbdb6 100644
--- a/types/nodemailer/lib/json-transport.d.ts
+++ b/types/nodemailer/lib/json-transport.d.ts
@@ -15,6 +15,7 @@ declare namespace JSONTransport {
 
     interface Options extends MailOptions, TransportOptions {
         jsonTransport: true;
+        skipEncoding?: boolean;
     }
 
     interface SentMessageInfo {
diff --git a/types/nodemailer/nodemailer-tests.ts b/types/nodemailer/nodemailer-tests.ts
index 6f045df08b..140b351c6b 100644
--- a/types/nodemailer/nodemailer-tests.ts
+++ b/types/nodemailer/nodemailer-tests.ts
@@ -832,7 +832,8 @@ function stream_buffer_unix_newlines_test() {
 
 function json_test() {
     const transporter = nodemailer.createTransport({
-        jsonTransport: true
+        jsonTransport: true,
+        skipEncoding: true
     });
     transporter.sendMail({
         from: 'sender@example.com',