diff --git a/lib_stusb_impl/usbd_impl.c b/lib_stusb_impl/usbd_impl.c
index 72b286c45..6c2cf80a6 100644
--- a/lib_stusb_impl/usbd_impl.c
+++ b/lib_stusb_impl/usbd_impl.c
@@ -1018,8 +1018,13 @@ uint8_t USBD_HID_DataIn_impl(USBD_HandleTypeDef *pdev, uint8_t epnum)
 
 uint8_t USBD_HID_DataOut_impl(USBD_HandleTypeDef *pdev,
                               uint8_t             epnum,
-                              uint8_t            *buffer,
-                              apdu_buffer_t      *apdu_buf)
+#ifndef HAVE_USB_HIDKBD
+                              uint8_t       *buffer,
+                              apdu_buffer_t *apdu_buf)
+#else
+                              __attribute__((unused)) uint8_t       *buffer,
+                              __attribute__((unused)) apdu_buffer_t *apdu_buf)
+#endif  // HAVE_USB_HIDKBD
 {
     // only the data hid endpoint will receive data
     switch (epnum) {