diff --git a/project/Core/Src/mug.c b/project/Core/Src/mug.c
index c85a17f..71917eb 100644
--- a/project/Core/Src/mug.c
+++ b/project/Core/Src/mug.c
@@ -13,10 +13,10 @@
 #include "mug.h"
 
 static void mqtt_pub_request_cb(void*, err_t);
-void example_publish(mqtt_client_client_t, void*);
+void example_publish(mqtt_client_t* , void*);
 static void mqtt_incoming_publish_cb(void*, const char*, u32_t);
 static void mqtt_incoming_data_cb(void*, const u8_t*, u16_t, u8_t);
-static void mqtt_sub_request_cb(void*, err_t*);
+static void mqtt_sub_request_cb(void*, err_t);
 static void mqtt_connection_cb(mqtt_client_t*, void*, mqtt_connection_status_t);
 void example_do_connect(mqtt_client_t*);