diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index b2b98dea156112773d344f3598d3375fa22b7ec4..3430482f8d8b9e9a63c9dda792a07035d58a6401 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -192,7 +192,7 @@ U_BOOT_DRIVER(serial_zynq) = {
 };
 
 #ifdef CONFIG_DEBUG_UART_ZYNQ
-void _debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 	struct uart_zynq *regs = (struct uart_zynq *)CONFIG_DEBUG_UART_BASE;