diff --git a/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash.c b/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash.c
index 54a9446ee0..168699d8e0 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash.c
@@ -223,12 +223,14 @@ static void HASH_DMAError(DMA_HandleTypeDef *hdma)
 static void HASH_WriteData(uint8_t *pInBuffer, uint32_t Size)
 {
   uint32_t buffercounter;
-  uint32_t inputaddr = (uint32_t) pInBuffer;
   
   for(buffercounter = 0U; buffercounter < Size; buffercounter+=4)
   {
-    HASH->DIN = *(uint32_t*)inputaddr;
-    inputaddr+=4U;
+    uint32_t data = (uint32_t) *pInBuffer++;
+    data |= (uint32_t) *pInBuffer++ << 8;
+    data |= (uint32_t) *pInBuffer++ << 16;
+    data |= (uint32_t) *pInBuffer++ << 24;
+    HASH->DIN = data;
   }
 }
 
diff --git a/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash_ex.c b/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash_ex.c
index 4d882315e8..19eb7cbe50 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash_ex.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_hash_ex.c
@@ -137,12 +137,14 @@ static void HASHEx_DMAError(DMA_HandleTypeDef *hdma);
 static void HASHEx_WriteData(uint8_t *pInBuffer, uint32_t Size)
 {
   uint32_t buffercounter;
-  uint32_t inputaddr = (uint32_t) pInBuffer;
   
   for(buffercounter = 0U; buffercounter < Size; buffercounter+=4U)
   {
-    HASH->DIN = *(uint32_t*)inputaddr;
-    inputaddr+=4U;
+    uint32_t data = (uint32_t) *pInBuffer++;
+    data |= (uint32_t) *pInBuffer++ << 8;
+    data |= (uint32_t) *pInBuffer++ << 16;
+    data |= (uint32_t) *pInBuffer++ << 24;
+    HASH->DIN = data;
   }
 }