diff --git a/drivers/serial/uart_ns16550.c b/drivers/serial/uart_ns16550.c
index 65aa1c38770..e9a4398e7f8 100644
--- a/drivers/serial/uart_ns16550.c
+++ b/drivers/serial/uart_ns16550.c
@@ -1295,15 +1295,11 @@ static const struct uart_driver_api uart_ns16550_driver_api = {
 #define UART_NS16550_IRQ_FUNC_DEFINE(n)
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */
 
-#define DEV_CONFIG_PCIE0(n)
-#define DEV_CONFIG_PCIE1(n) DEVICE_PCIE_INST_INIT(n, pcie)
 #define DEV_CONFIG_PCIE_INIT(n) \
-	_CONCAT(DEV_CONFIG_PCIE, DT_INST_ON_BUS(n, pcie))(n)
+	COND_CODE_1(DT_INST_ON_BUS(n, pcie), (DEVICE_PCIE_INST_INIT(n, pcie)), ())
 
-#define DEV_DECLARE_PCIE0(n)
-#define DEV_DECLARE_PCIE1(n) DEVICE_PCIE_INST_DECLARE(n)
 #define DEV_PCIE_DECLARE(n) \
-	_CONCAT(DEV_DECLARE_PCIE, DT_INST_ON_BUS(n, pcie))(n)
+	COND_CODE_1(DT_INST_ON_BUS(n, pcie), (DEVICE_PCIE_INST_DECLARE(n)), ())
 
 #define DEV_DATA_FLOW_CTRL0 UART_CFG_FLOW_CTRL_NONE
 #define DEV_DATA_FLOW_CTRL1 UART_CFG_FLOW_CTRL_RTS_CTS