diff --git a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/CMSIS/stm32f4xx.h b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/CMSIS/stm32f4xx.h
index d3beea922e..ffedae725a 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/CMSIS/stm32f4xx.h
+++ b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/CMSIS/stm32f4xx.h
@@ -8,8 +8,8 @@
   *          is using in the C source code, usually in main.c. This file contains:
   *           - Configuration section that allows to select:
   *              - The STM32F4xx device used in the target application
-  *              - To use or not the peripheral’s drivers in application code(i.e. 
-  *                code will be based on direct access to peripheral’s registers 
+  *              - To use or not the peripheral's drivers in application code(i.e.
+  *                code will be based on direct access to peripheral's registers
   *                rather than drivers API), this option is controlled by 
   *                "#define USE_HAL_DRIVER"
   *  
diff --git a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp.c b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp.c
index efb64e596a..23fb46ed0a 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp.c
@@ -470,7 +470,7 @@ HAL_StatusTypeDef HAL_CRYP_Init(CRYP_HandleTypeDef *hcryp)
   }
 #endif /* (USE_HAL_CRYP_REGISTER_CALLBACKS) */
 
-  /* Set the key size(This bit field is don’t care in the DES or TDES modes) data type and Algorithm */
+  /* Set the key size(This bit field is don't care in the DES or TDES modes) data type and Algorithm */
 #if defined (CRYP)
 
   MODIFY_REG(hcryp->Instance->CR, CRYP_CR_DATATYPE | CRYP_CR_KEYSIZE | CRYP_CR_ALGOMODE,
@@ -589,7 +589,7 @@ HAL_StatusTypeDef HAL_CRYP_SetConfig(CRYP_HandleTypeDef *hcryp, CRYP_ConfigTypeD
     hcryp->Init.KeyIVConfigSkip = pConf->KeyIVConfigSkip;
     hcryp->Init.HeaderWidthUnit = pConf->HeaderWidthUnit;
 
-    /* Set the key size(This bit field is don’t care in the DES or TDES modes) data type, AlgoMode and operating mode*/
+    /* Set the key size(This bit field is don't care in the DES or TDES modes) data type, AlgoMode and operating mode*/
 #if defined (CRYP)
 
     MODIFY_REG(hcryp->Instance->CR, CRYP_CR_DATATYPE | CRYP_CR_KEYSIZE | CRYP_CR_ALGOMODE,
diff --git a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp_ex.c b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp_ex.c
index 43b238a13b..b3af317f02 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp_ex.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_cryp_ex.c
@@ -177,7 +177,7 @@ HAL_StatusTypeDef HAL_CRYPEx_AESGCM_GenerateAuthTAG(CRYP_HandleTypeDef *hcryp, u
     /* Select final phase */
     MODIFY_REG(hcryp->Instance->CR, CRYP_CR_GCM_CCMPH, CRYP_PHASE_FINAL);
 
-    /*ALGODIR bit must be set to ‘0’.*/
+    /*ALGODIR bit must be set to '0'.*/
     hcryp->Instance->CR &=  ~CRYP_CR_ALGODIR;
 
     /* Enable the CRYP peripheral */
@@ -395,7 +395,7 @@ HAL_StatusTypeDef HAL_CRYPEx_AESCCM_GenerateAuthTAG(CRYP_HandleTypeDef *hcryp, u
     /* Disable CRYP to start the final phase */
     __HAL_CRYP_DISABLE(hcryp);
 
-    /* Select final phase & ALGODIR bit must be set to ‘0’. */
+    /* Select final phase & ALGODIR bit must be set to '0'. */
     MODIFY_REG(hcryp->Instance->CR, CRYP_CR_GCM_CCMPH | CRYP_CR_ALGODIR, CRYP_PHASE_FINAL | CRYP_OPERATINGMODE_ENCRYPT);
 
     /* Enable the CRYP peripheral */
diff --git a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_wwdg.c b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_wwdg.c
index d1e2fa071e..e853ba2d11 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_wwdg.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/STM32Cube_FW/STM32F4xx_HAL_Driver/stm32f4xx_hal_wwdg.c
@@ -40,7 +40,7 @@
         (++) max time (mS) = 1000 * (Counter - 0x40) / WWDG clock
     (+) Typical values:
         (++) Counter min (T[5;0] = 0x00) at 42MHz (PCLK1) with zero prescaler:
-             max timeout before reset: approximately 97.52µs
+             max timeout before reset: approximately 97.52us
         (++) Counter max (T[5;0] = 0x3F) at 42MHz (PCLK1) with prescaler
              dividing by 8:
              max timeout before reset: approximately 49.93ms