diff --git a/message.go b/message.go
index 3ec2715..f2456c1 100644
--- a/message.go
+++ b/message.go
@@ -60,7 +60,7 @@ func (s *Session) GetInbox() ([]Message, error) {
 }
 
 // SendMessage will send a message via post
-func (s *Session) SendMessage(subject string, body string, recipientid int) error {
+func (s *Session) SendMessage(subject string, body string, recipientid string) error {
 	payload := map[string]interface{}{
 		"subject":     subject,
 		"body":        body,