diff --git a/drivers/tty/serial/rk_serial.c b/drivers/tty/serial/rk_serial.c
index 1818c45e02ba..5272a00100af 100644
--- a/drivers/tty/serial/rk_serial.c
+++ b/drivers/tty/serial/rk_serial.c
@@ -161,7 +161,9 @@ static void dbg(const char *fmt, ...)
 	vsprintf(buff, fmt, va);
 	va_end(va);
 
+#if defined(CONFIG_DEBUG_LL) || defined(CONFIG_RK_EARLY_PRINTK)
 	printascii(buff);
+#endif
 }
 
 //enable log output