diff --git a/chips/chip_name/vendor_name_uart.c b/chips/chip_name/vendor_name_uart.c
index 1d01cdd48b3f369e3959f78e8139129aceb2fb3b..5f5b52f5f14daf50354bc638d689a6d1d079cd9a 100644
--- a/chips/chip_name/vendor_name_uart.c
+++ b/chips/chip_name/vendor_name_uart.c
@@ -53,7 +53,7 @@ void arm_serialinit(void)
 
 }
 
-int up_putc(int ch)
+void up_putc(int ch)
 {
-  return ch;
+
 }