case REQ_GetOSFeatureDescriptor:
                        if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_VENDOR | REQREC_DEVICE))
                        {
-                               void*    DescriptorPointer;
-                               uint16_t DescriptorSize = USB_GetOSFeatureDescriptor(USB_ControlRequest.wValue, USB_ControlRequest.wIndex,
-                                                                                    &DescriptorPointer);
+                               const void* DescriptorPointer;
+                               uint16_t    DescriptorSize = USB_GetOSFeatureDescriptor(USB_ControlRequest.wValue,
+                                                                                       USB_ControlRequest.wIndex,
+                                                                                       &DescriptorPointer);
 
                                if (DescriptorSize == NO_DESCRIPTOR)
                                  return;