diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 11a0ed6d6546..9c51b44e2284 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1558,8 +1558,8 @@ void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_driver
 
 	usb_deregister(udriver);
 
-	for (; *serial_drivers; ++serial_drivers)
-		usb_serial_deregister(*serial_drivers);
+	for (sd = serial_drivers; *sd; ++sd)
+		usb_serial_deregister(*sd);
 
 	kfree(udriver);
 }