diff --git a/TC1/mqtt_server/user_mqtt_client.c b/TC1/mqtt_server/user_mqtt_client.c
index a2bc8e2..b66b0f9 100644
--- a/TC1/mqtt_server/user_mqtt_client.c
+++ b/TC1/mqtt_server/user_mqtt_client.c
@@ -489,7 +489,7 @@ OSStatus UserMqttSendSocketState(char socket_id)
     return oss_status;
 }
 
-OSStatus UserMqttSendTotalSocketState()
+OSStatus UserMqttSendTotalSocketState(void)
 {
     char *send_buf = malloc(64);
     char *topic_buf = malloc(64);