diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 494052dbd39f..f963b76e5fc0 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -909,10 +909,11 @@ static int m41t80_probe(struct i2c_client *client)
 	if (IS_ERR(m41t80_data->rtc))
 		return PTR_ERR(m41t80_data->rtc);
 
-#ifdef CONFIG_OF
-	wakeup_source = of_property_read_bool(client->dev.of_node,
-					      "wakeup-source");
-#endif
+	if (IS_ENABLED(CONFIG_OF)) {
+		wakeup_source = of_property_read_bool(client->dev.of_node,
+						      "wakeup-source");
+	}
+
 	if (client->irq > 0) {
 		rc = devm_request_threaded_irq(&client->dev, client->irq,
 					       NULL, m41t80_handle_irq,