diff --git a/test_sms.yml b/test_sms.yml
index b655a2b..54f9227 100644
--- a/test_sms.yml
+++ b/test_sms.yml
@@ -16,7 +16,7 @@
 
     - name: Send SMS message
       uri:
-        url: "https://sms.internet-master.cz/send/?number={{ sms_number }}&message={{ random_string | urlencode }}&type=class-1&username={{ sms_username }}&password={{ sms_password_send }}"
+        url: "https://sms.internet-master.cz/send/?number={{ sms_number }}&message=@mikrotik@{{ random_string | urlencode }}&type=class-1&username={{ sms_username }}&password={{ sms_password_send }}"
         method: GET
         return_content: true
       register: send_result