diff --git a/module_usb_audio/endpoint0/endpoint0.c b/module_usb_audio/endpoint0/endpoint0.c
index 99449f5f..7ec06c09 100755
--- a/module_usb_audio/endpoint0/endpoint0.c
+++ b/module_usb_audio/endpoint0/endpoint0.c
@@ -331,7 +331,7 @@ void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
                         case USB_GET_DESCRIPTOR:
 
                             /* Check what inteface request is for */
-                            if(sp.wIndex == INTERFACE_NUM_HID)
+                            if(sp.wIndex == INTERFACE_NUMBER_HID)
                             {
                                 /* High byte of wValue is descriptor type */
                                 unsigned descriptorType = sp.wValue & 0xff00;