diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index facadd2..9027781 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -101,7 +101,7 @@
 char NS16550_getc(NS16550_t com_port)
 {
 	while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
-#ifdef CONFIG_USB_TTY
+#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
 		extern void usbtty_poll(void);
 		usbtty_poll();
 #endif