diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c
index 1a58851d4b..1a038a222e 100644
--- a/hw/usb/dev-serial.c
+++ b/hw/usb/dev-serial.c
@@ -113,7 +113,7 @@ struct USBSerialState {
 typedef struct USBSerialState USBSerialState;
 
 #define TYPE_USB_SERIAL "usb-serial-dev"
-DECLARE_INSTANCE_CHECKER(USBSerialState, USB_SERIAL_DEV,
+DECLARE_INSTANCE_CHECKER(USBSerialState, USB_SERIAL,
                          TYPE_USB_SERIAL)
 
 enum {
@@ -517,7 +517,7 @@ static void usb_serial_event(void *opaque, QEMUChrEvent event)
 
 static void usb_serial_realize(USBDevice *dev, Error **errp)
 {
-    USBSerialState *s = USB_SERIAL_DEV(dev);
+    USBSerialState *s = USB_SERIAL(dev);
     Error *local_err = NULL;
 
     usb_desc_create_serial(dev);