diff --git a/usbd_conf.c b/usbd_conf.c
--- a/usbd_conf.c
+++ b/usbd_conf.c
@@ -53,7 +53,7 @@ PCD_HandleTypeDef hpcd_USB_FS;
 static void SystemClockConfig_Resume(void);
 /* USER CODE END 1 */
 void HAL_PCDEx_SetConnectionState(PCD_HandleTypeDef *hpcd, uint8_t state);
-extern void SystemClock_Config(void);
+extern void systemclock_config(void);
 
 /*******************************************************************************
 		       LL Driver Callbacks (PCD -> USB Device Library)
@@ -502,7 +502,7 @@ void USBD_static_free(void *p)
   */
 static void SystemClockConfig_Resume(void)
 {
-	SystemClock_Config();
+	systemclock_config();
 }
 /* USER CODE END 4 */