diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index f200677851b8..68edc97f1926 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1131,7 +1131,7 @@ static int sony_nc_setup_rfkill(struct acpi_device *device,
 	return err;
 }
 
-static void sony_nc_rfkill_update()
+static void sony_nc_rfkill_update(void)
 {
 	enum sony_nc_rfkill i;
 	int result;