diff --git a/testex/STM32/STM32L4xx/I2C-LIS3MLD/main.c b/testex/STM32/STM32L4xx/I2C-LIS3MLD/main.c
index 5a8d68880..fa767e48a 100644
--- a/testex/STM32/STM32L4xx/I2C-LIS3MLD/main.c
+++ b/testex/STM32/STM32L4xx/I2C-LIS3MLD/main.c
@@ -46,8 +46,8 @@ static const I2CConfig i2ccfg = {
 static LIS3MDLConfig LIS3MDLcfg = {
   &I2CD1,                                    /* Pointer to I2C Driver.*/
   &i2ccfg,                                   /* Pointer to I2C Configuration.*/
-  {0, 0, 0},                                 /* Use default sensitivity.*/
-  {0, 0, 0},                                 /* Use default bias.*/
+  NULL,                                      /* Use default sensitivity.*/
+  NULL,                                      /* Use default bias.*/
   LIS3MDL_SAD_VCC,                           /* Slave address.*/
   LIS3MDL_FS_4GA,                            /* Full scale value.*/
   LIS3MDL_ODR_40HZ,                          /* Output data rate.*/
diff --git a/testex/STM32/STM32L4xx/I2C-LSM6DS0/main.c b/testex/STM32/STM32L4xx/I2C-LSM6DS0/main.c
index f8e156dde..5c2626ffe 100644
--- a/testex/STM32/STM32L4xx/I2C-LSM6DS0/main.c
+++ b/testex/STM32/STM32L4xx/I2C-LSM6DS0/main.c
@@ -46,8 +46,8 @@ static const I2CConfig i2ccfg = {
 };
 
 static const LSM6DS0AccConfig lsm6ds0acccfg = {
-  {0, 0, 0},                    /* Use default sensitivity.*/
-  {0, 0, 0},                    /* Use default bias.*/
+  NULL,                         /* Use default sensitivity.*/
+  NULL,                         /* Use default bias.*/
   LSM6DS0_ACC_FS_2G,            /* Full scale value 2g.*/
   LSM6DS0_ACC_ODR_50Hz,         /* Output data rate 100 Hz.*/
 #if LSM6DS0_ACC_USE_ADVANCED || defined(__DOXYGEN__)