diff --git a/libraries/HAL_Drivers/drv_usart.c b/libraries/HAL_Drivers/drv_usart.c
index 7829751..10b7310 100644
--- a/libraries/HAL_Drivers/drv_usart.c
+++ b/libraries/HAL_Drivers/drv_usart.c
@@ -1024,11 +1024,11 @@ static void stm32_uart_get_dma_config(void)
 #endif
 
 #ifdef BSP_USING_UART9
-    uart_obj[UART8_INDEX].uart_dma_flag = 0;
+    uart_obj[UART9_INDEX].uart_dma_flag = 0;
 #ifdef BSP_UART9_RX_USING_DMA
     uart_obj[UART9_INDEX].uart_dma_flag |= RT_DEVICE_FLAG_DMA_RX;
     static struct dma_config uart9_dma_rx = UART9_DMA_RX_CONFIG;
-    uart_config[UART9_INDEX].dma_rx = &uart8_dma_rx;
+    uart_config[UART9_INDEX].dma_rx = &uart9_dma_rx;
 #endif
 #ifdef BSP_UART9_TX_USING_DMA
     uart_obj[UART9_INDEX].uart_dma_flag |= RT_DEVICE_FLAG_DMA_TX;