diff --git a/drivers/serial/uart_npcx.c b/drivers/serial/uart_npcx.c
index 0968aca933..0b9ce389cf 100644
--- a/drivers/serial/uart_npcx.c
+++ b/drivers/serial/uart_npcx.c
@@ -438,8 +438,8 @@ static inline bool uart_npcx_device_is_transmitting(const struct device *dev)
 	return 0;
 }
 
-static inline int uart_npcx_pm_action(const struct device *dev,
-				      enum pm_device_action action)
+static int uart_npcx_pm_action(const struct device *dev,
+			       enum pm_device_action action)
 {
 	/* If next device power state is SUSPEND power state */
 	switch (action) {