diff --git a/example/ancs_client_demo.c b/example/ancs_client_demo.c
index afd4dc8c4..2b4971a2a 100644
--- a/example/ancs_client_demo.c
+++ b/example/ancs_client_demo.c
@@ -132,7 +132,7 @@ static void ancs_callback(uint8_t packet_type, uint16_t channel, uint8_t *packet
 int btstack_main(int argc, const char * argv[]);
 int btstack_main(int argc, const char * argv[]){
     
-    UNUSED(argc);
+    (void)argc;
     (void)argv;
 
     printf("BTstack ANCS Client starting up...\n");
diff --git a/example/gatt_battery_query.c b/example/gatt_battery_query.c
index 937d9c15d..071020a6a 100644
--- a/example/gatt_battery_query.c
+++ b/example/gatt_battery_query.c
@@ -333,8 +333,8 @@ int btstack_main(int argc, const char * argv[]){
         return 0;
     }
 #else
-    UNUSED(argc);
-    UNUSED(argv);
+    (void)argc;
+    (void)argv;
 #endif
 
     hci_event_callback_registration.callback = &hci_event_handler;
diff --git a/example/gatt_browser.c b/example/gatt_browser.c
index 67554b7a8..c06eff8ca 100644
--- a/example/gatt_browser.c
+++ b/example/gatt_browser.c
@@ -293,8 +293,8 @@ int btstack_main(int argc, const char * argv[]){
         return 0;
 	}
 #else
-    UNUSED(argc);
-    UNUSED(argv);
+    (void)argc;
+    (void)argv;
 #endif
 
     // setup ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android phones
diff --git a/example/le_streamer.c b/example/le_streamer.c
index 19f2d1341..ec8ce0012 100644
--- a/example/le_streamer.c
+++ b/example/le_streamer.c
@@ -185,6 +185,7 @@ static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *pack
                     break;  
                 case ATT_EVENT_MTU_EXCHANGE_COMPLETE:
                     mtu = att_event_mtu_exchange_complete_get_MTU(packet) - 3;
+                    mtu = 27;
                     printf("ATT MTU = %u\n", mtu);
                     test_data_len = mtu - 3;
                     if (test_data_len > sizeof(test_data)){
diff --git a/example/le_streamer_client.c b/example/le_streamer_client.c
index 29d2845f8..5a1bb2266 100644
--- a/example/le_streamer_client.c
+++ b/example/le_streamer_client.c
@@ -264,8 +264,8 @@ int btstack_main(int argc, const char * argv[]){
         return 0;
     }
 #else
-    UNUSED(argc);
-    UNUSED(argv);
+    (void)argc;
+    (void)argv;
 #endif
 
     hci_event_callback_registration.callback = &hci_event_handler;
diff --git a/example/panu_demo.c b/example/panu_demo.c
index 8139342d9..63a586457 100644
--- a/example/panu_demo.c
+++ b/example/panu_demo.c
@@ -563,8 +563,8 @@ static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *pack
 int btstack_main(int argc, const char * argv[]);
 int btstack_main(int argc, const char * argv[]){
 
-    UNUSED(argc);
-    (void)(argv);
+    (void)argc;
+    (void)argv;
 
     printf("Client HCI init done\n");