diff --git a/bsp/at32/libraries/usbd_library/src/usbd_int.c b/bsp/at32/libraries/usbd_library/src/usbd_int.c
index 09add2bde1..494063da7e 100644
--- a/bsp/at32/libraries/usbd_library/src/usbd_int.c
+++ b/bsp/at32/libraries/usbd_library/src/usbd_int.c
@@ -311,31 +311,31 @@ void usbd_wakeup_handler(usbd_core_type *udev)
   /* user define wakeup event */
 }
 
-RT_WEAK void usbd_reset_callback(usbd_core_type *udev)
+rt_weak void usbd_reset_callback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_setup_phase_done_callback(usbd_core_type *udev)
+rt_weak void usbd_setup_phase_done_callback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_data_in_stage_callback(usbd_core_type *udev, uint32_t ept_num)
+rt_weak void usbd_data_in_stage_callback(usbd_core_type *udev, uint32_t ept_num)
 {
 }
 
-RT_WEAK void usbd_sof_callback(usbd_core_type *udev)
+rt_weak void usbd_sof_callback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_data_out_stage_callback(usbd_core_type *udev, uint32_t ept_num)
+rt_weak void usbd_data_out_stage_callback(usbd_core_type *udev, uint32_t ept_num)
 {
 }
 
-RT_WEAK void usbd_connectCallback(usbd_core_type *udev)
+rt_weak void usbd_connectCallback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_disconnectCallback(usbd_core_type *udev)
+rt_weak void usbd_disconnectCallback(usbd_core_type *udev)
 {
 }
 
diff --git a/bsp/at32/libraries/usbfs_library/src/usbd_int.c b/bsp/at32/libraries/usbfs_library/src/usbd_int.c
index 34fe28d729..31c1a6479c 100644
--- a/bsp/at32/libraries/usbfs_library/src/usbd_int.c
+++ b/bsp/at32/libraries/usbfs_library/src/usbd_int.c
@@ -521,31 +521,31 @@ void usbd_wakeup_handler(usbd_core_type *udev)
     udev->class_handler->event_handler(udev, USBD_WAKEUP_EVENT);
 }
 
-RT_WEAK void usbd_reset_callback(usbd_core_type *udev)
+rt_weak void usbd_reset_callback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_setup_phase_done_callback(usbd_core_type *udev)
+rt_weak void usbd_setup_phase_done_callback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_data_in_stage_callback(usbd_core_type *udev, uint32_t ept_num)
+rt_weak void usbd_data_in_stage_callback(usbd_core_type *udev, uint32_t ept_num)
 {
 }
 
-RT_WEAK void usbd_sof_callback(usbd_core_type *udev)
+rt_weak void usbd_sof_callback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_data_out_stage_callback(usbd_core_type *udev, uint32_t ept_num)
+rt_weak void usbd_data_out_stage_callback(usbd_core_type *udev, uint32_t ept_num)
 {
 }
 
-RT_WEAK void usbd_connectCallback(usbd_core_type *udev)
+rt_weak void usbd_connectCallback(usbd_core_type *udev)
 {
 }
 
-RT_WEAK void usbd_disconnectCallback(usbd_core_type *udev)
+rt_weak void usbd_disconnectCallback(usbd_core_type *udev)
 {
 }
 
diff --git a/bsp/at32/libraries/usbfs_library/src/usbh_int.c b/bsp/at32/libraries/usbfs_library/src/usbh_int.c
index 886d22062e..fe763e6c03 100644
--- a/bsp/at32/libraries/usbfs_library/src/usbh_int.c
+++ b/bsp/at32/libraries/usbfs_library/src/usbh_int.c
@@ -520,15 +520,15 @@ void usbh_port_handler(usbh_core_type *uhost)
   usb_host->hprt = prt_0;
 }
 
-RT_WEAK void usbh_connect_callback(usbh_core_type *uhost)
+rt_weak void usbh_connect_callback(usbh_core_type *uhost)
 {
 }
 
-RT_WEAK void usbh_disconnect_callback(usbh_core_type *uhost)
+rt_weak void usbh_disconnect_callback(usbh_core_type *uhost)
 {
 }
 
-RT_WEAK void usbd_notify_urbchange_callback(usbh_core_type *uhost, uint8_t chnum, urb_sts_type sts)
+rt_weak void usbd_notify_urbchange_callback(usbh_core_type *uhost, uint8_t chnum, urb_sts_type sts)
 {
 }