diff --git a/ch32v003fun/ch32v003fun.h b/ch32v003fun/ch32v003fun.h
index 86c511e3c5a899d8f283fb8c558e027123ae1f9d..13633fc35ed113279697c83de28e56d967d09491 100644
--- a/ch32v003fun/ch32v003fun.h
+++ b/ch32v003fun/ch32v003fun.h
@@ -5232,6 +5232,8 @@ void SystemInit(void);
 // Put an output debug UART on Pin D5.
 // You can write to this with printf(...) or puts(...)
 
+void SetupUART( int uartBRR );
+
 void WaitForDebuggerToAttach();
 
 // Just a definition to the internal _write function.