diff --git a/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h b/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h
index 334e31f15abd217627c48a8582736832420f41c6..48e7ec8cb448ff8eb598ec5664043c6517c528e8 100644
--- a/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h
+++ b/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h
@@ -48,6 +48,7 @@
 #include "stm32l4xx.h"
 #include "Legacy/stm32_hal_legacy.h"  /* Aliases file for old names compatibility */
 #include <stdio.h>
+#include <stdlib.h>
 
 /* Exported types ------------------------------------------------------------*/
 
diff --git a/bsp/stm32l476-nucleo/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h b/bsp/stm32l476-nucleo/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h
index 334e31f15abd217627c48a8582736832420f41c6..48e7ec8cb448ff8eb598ec5664043c6517c528e8 100644
--- a/bsp/stm32l476-nucleo/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h
+++ b/bsp/stm32l476-nucleo/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_def.h
@@ -48,6 +48,7 @@
 #include "stm32l4xx.h"
 #include "Legacy/stm32_hal_legacy.h"  /* Aliases file for old names compatibility */
 #include <stdio.h>
+#include <stdlib.h>
 
 /* Exported types ------------------------------------------------------------*/