1 files changed, 1 insertions, 0 deletions
diff --git a/hw/usb.h b/hw/usb.h
index f6df0ad0f8..d60d03df9c 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -327,6 +327,7 @@ struct USBPacket {
     int pid;
     USBEndpoint *ep;
     QEMUIOVector iov;
+    uint64_t parameter; /* control transfers */
     int result; /* transfer length or USB_RET_* status code */
     /* Internal use by the USB layer.  */
     USBPacketState state;