diff --git a/src/application/controllers/backend_api.php b/src/application/controllers/backend_api.php
index 27e02c78..9f239f7e 100644
--- a/src/application/controllers/backend_api.php
+++ b/src/application/controllers/backend_api.php
@@ -190,7 +190,7 @@ class Backend_api extends CI_Controller {
                 
                 if (!$manage_mode) {
                     $customer_title = $this->lang->line('appointment_booked');
-                    $customer_message = $this->lang->line('thank_your_for_appointment');
+                    $customer_message = $this->lang->line('thank_you_for_appointment');
                     $customer_link = $this->config->item('base_url') . '/index.php/appointments/index/' 
                             . $appointment['hash'];