diff --git a/right/src/usb_protocol_handler.c b/right/src/usb_protocol_handler.c
index 44c1152..bf8ab92 100644
--- a/right/src/usb_protocol_handler.c
+++ b/right/src/usb_protocol_handler.c
@@ -79,6 +79,7 @@ void UsbProtocolHandler(void)
             UsbCommand_SendKbootCommand();
             break;
         default:
+            SetUsbError(UsbResponse_InvalidCommand);
             break;
     }
 }
diff --git a/right/src/usb_protocol_handler.h b/right/src/usb_protocol_handler.h
index c119417..9159a8d 100644
--- a/right/src/usb_protocol_handler.h
+++ b/right/src/usb_protocol_handler.h
@@ -27,8 +27,8 @@
     } usb_command_id_t;
 
     typedef enum {
-        UsbResponse_Success      = 0,
-        UsbResponse_GenericError = 1,
+        UsbResponse_Success        = 0,
+        UsbResponse_InvalidCommand = 1,
     } usb_response_t;
 
     typedef enum {