diff --git a/Drivers/STM32F1xx_HAL_Driver/Inc/stm32f1xx_hal_dma.h b/Drivers/STM32F1xx_HAL_Driver/Inc/stm32f1xx_hal_dma.h
index 9a407f4..39ca574 100644
--- a/Drivers/STM32F1xx_HAL_Driver/Inc/stm32f1xx_hal_dma.h
+++ b/Drivers/STM32F1xx_HAL_Driver/Inc/stm32f1xx_hal_dma.h
@@ -116,7 +116,7 @@ typedef struct __DMA_HandleTypeDef
   
   HAL_LockTypeDef       Lock;                            /*!< DMA locking object                     */  
   
-  HAL_DMA_StateTypeDef  State;                           /*!< DMA transfer state                     */
+  __IO HAL_DMA_StateTypeDef  State;                           /*!< DMA transfer state                     */
   
   void                  *Parent;                                                      /*!< Parent object state                    */