diff --git a/src/class/bth/bth_device.c b/src/class/bth/bth_device.c
index 1d27ae7c..09fab953 100755
--- a/src/class/bth/bth_device.c
+++ b/src/class/bth/bth_device.c
@@ -214,7 +214,7 @@ bool btd_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t c
     }
     else return false;
 
-    return tud_control_xfer(rhport, request, &_btd_itf.hci_cmd, request->wLength);
+    return tud_control_xfer(rhport, request, &_btd_itf.hci_cmd, sizeof(_btd_itf.hci_cmd));
   }
   else if ( stage == CONTROL_STAGE_DATA )
   {