diff --git a/targets/TARGET_STM/TARGET_STM32G0/STM32Cube_FW/STM32G0xx_HAL_Driver/stm32g0xx_ll_rtc.h b/targets/TARGET_STM/TARGET_STM32G0/STM32Cube_FW/STM32G0xx_HAL_Driver/stm32g0xx_ll_rtc.h
index dff7098db2..d220592e90 100644
--- a/targets/TARGET_STM/TARGET_STM32G0/STM32Cube_FW/STM32G0xx_HAL_Driver/stm32g0xx_ll_rtc.h
+++ b/targets/TARGET_STM/TARGET_STM32G0/STM32Cube_FW/STM32G0xx_HAL_Driver/stm32g0xx_ll_rtc.h
@@ -3074,7 +3074,7 @@ __STATIC_INLINE void LL_RTC_BKP_SetRegister(TAMP_TypeDef *TAMPx, uint32_t Backup
   */
 __STATIC_INLINE uint32_t LL_RTC_BKP_GetRegister(TAMP_TypeDef *TAMPx, uint32_t BackupRegister)
 {
-  register __IO uint32_t *tmp;
+  const register __IO uint32_t *tmp;
 
   tmp = &(TAMPx->BKP0R) + BackupRegister;