diff --git a/ch32v003fun/ch32v003fun.h b/ch32v003fun/ch32v003fun.h
index c6e20704e4ecfe70a299034dbdda5bb782522519..2d3849d6f14f6d6ea968311708a59f3b2101ddfe 100644
--- a/ch32v003fun/ch32v003fun.h
+++ b/ch32v003fun/ch32v003fun.h
@@ -12459,6 +12459,8 @@ 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.