diff --git a/drivers/serial/uart_gecko.c b/drivers/serial/uart_gecko.c
index 11c396bcd9f1f4..32d3c71c910c15 100644
--- a/drivers/serial/uart_gecko.c
+++ b/drivers/serial/uart_gecko.c
@@ -492,13 +492,15 @@ static int uart_gecko_init(const struct device *dev)
 #ifdef CONFIG_PM_DEVICE
 static int uart_gecko_pm_action(const struct device *dev, enum pm_device_action action)
 {
-	const struct uart_gecko_config *config = dev->config;
+	__maybe_unused const struct uart_gecko_config *config = dev->config;
 
 	switch (action) {
 	case PM_DEVICE_ACTION_SUSPEND:
+#ifdef USART_STATUS_TXIDLE
 		/* Wait for TX FIFO to flush before suspending */
 		while (!(USART_StatusGet(config->base) & USART_STATUS_TXIDLE)) {
 		}
+#endif
 		break;
 
 	case PM_DEVICE_ACTION_RESUME: