diff --git a/hw/usb/dev-audio.c b/hw/usb/dev-audio.c
index d5ac1f8962..1897fff9e6 100644
--- a/hw/usb/dev-audio.c
+++ b/hw/usb/dev-audio.c
@@ -124,7 +124,6 @@ static const USBDescIface desc_iface[] = {
         .bNumEndpoints                 = 0,
         .bInterfaceClass               = USB_CLASS_AUDIO,
         .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_CONTROL,
-        .bInterfaceProtocol            = 0x04,
         .iInterface                    = STRING_USBAUDIO_CONTROL,
         .ndesc                         = 4,
         .descs = (USBDescOther[]) {
@@ -282,7 +281,6 @@ static const USBDescIface desc_iface_multi[] = {
         .bNumEndpoints                 = 0,
         .bInterfaceClass               = USB_CLASS_AUDIO,
         .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_CONTROL,
-        .bInterfaceProtocol            = 0x04,
         .iInterface                    = STRING_USBAUDIO_CONTROL,
         .ndesc                         = 4,
         .descs = (USBDescOther[]) {
@@ -293,7 +291,7 @@ static const USBDescIface desc_iface_multi[] = {
                     USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
                     DST_AC_HEADER,              /*  u8  bDescriptorSubtype */
                     U16(0x0100),                /* u16  bcdADC */
-                    U16(0x38),                  /* u16  wTotalLength */
+                    U16(0x37),                  /* u16  wTotalLength */
                     0x01,                       /*  u8  bInCollection */
                     0x01,                       /*  u8  baInterfaceNr */
                 }