diff --git a/examples/transactional-email.js b/examples/transactional-email.js
index c7c686e..f3e96bf 100644
--- a/examples/transactional-email.js
+++ b/examples/transactional-email.js
@@ -36,7 +36,7 @@ let req = new SendEmailRequest({
   body: '',
   plaintext_body: '',
   amp_body: '',
-  fake_bcc: '',
+  fake_bcc: false,
 
   disable_message_retention: false,
   send_to_unsubscribed: false,
diff --git a/lib/api/requests.ts b/lib/api/requests.ts
index 87eea1a..c62e9f8 100644
--- a/lib/api/requests.ts
+++ b/lib/api/requests.ts
@@ -13,7 +13,7 @@ type SendEmailRequestOptionalOptions = Partial<{
   bcc: string;
   plaintext_body: string;
   amp_body: string;
-  fake_bcc: string;
+  fake_bcc: boolean;
   disable_message_retention: boolean;
   send_to_unsubscribed: boolean;
   tracked: boolean;