diff --git a/client/cmdmain.h b/client/cmdmain.h
index 6c11f6429..c3665370f 100644
--- a/client/cmdmain.h
+++ b/client/cmdmain.h
@@ -15,7 +15,7 @@
 #include <stddef.h>
 #include "usb_cmd.h"
 #include "cmdparser.h"
-extern void UsbCommandReceived(UsbCommand *UC);
+extern void UsbCommandReceived(UsbCommand *c);
 extern int CommandReceived(char *Cmd);
 extern bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout);
 extern bool WaitForResponse(uint32_t cmd, UsbCommand* response);