diff --git a/targets/TARGET_STM/TARGET_STM32H7/device/stm32h7xx_hal_rtc.h b/targets/TARGET_STM/TARGET_STM32H7/device/stm32h7xx_hal_rtc.h
index 7b070bf23c..292c20074d 100644
--- a/targets/TARGET_STM/TARGET_STM32H7/device/stm32h7xx_hal_rtc.h
+++ b/targets/TARGET_STM/TARGET_STM32H7/device/stm32h7xx_hal_rtc.h
@@ -27,6 +27,7 @@
 
 /* Includes ------------------------------------------------------------------*/
 #include "stm32h7xx_hal_def.h"
+#include "stm32h7xx_ll_rtc.h" // MBED PATCH
 
 /** @addtogroup STM32H7xx_HAL_Driver
   * @{