diff --git a/include/linux/usb/audio.h b/include/linux/usb/audio.h
index bcf4fb4..f75092a 100644
--- a/include/linux/usb/audio.h
+++ b/include/linux/usb/audio.h
@@ -24,7 +24,6 @@
 #define USB_SUBCLASS_AUDIOCONTROL	0x01
 #define USB_SUBCLASS_AUDIOSTREAMING	0x02
 #define USB_SUBCLASS_MIDISTREAMING	0x03
-#define USB_SUBCLASS_VENDOR_SPEC	0xff
 
 /* A.5 Audio Class-Specific AC interface Descriptor Subtypes*/
 #define HEADER				0x01
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 8f8b741..94012e6 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -258,6 +258,8 @@
 #define USB_CLASS_APP_SPEC		0xfe
 #define USB_CLASS_VENDOR_SPEC		0xff
 
+#define USB_SUBCLASS_VENDOR_SPEC	0xff
+
 /*-------------------------------------------------------------------------*/
 
 /* USB_DT_CONFIG: Configuration descriptor information.