diff --git a/backend/mpc-system/test_create_session.go b/backend/mpc-system/test_create_session.go
index 157a43e1..46600ae2 100644
--- a/backend/mpc-system/test_create_session.go
+++ b/backend/mpc-system/test_create_session.go
@@ -59,6 +59,7 @@ func main() {
 	sessionData := map[string]interface{}{
 		"threshold_n": 3,
 		"threshold_t": 2,
+		"username":    "admin",
 	}
 
 	jsonData, err := json.Marshal(sessionData)