diff --git a/arch/arm/src/stm32l4/stm32l4_serial.c b/arch/arm/src/stm32l4/stm32l4_serial.c
index 1d6c7a8b47f..176e3e678f2 100644
--- a/arch/arm/src/stm32l4/stm32l4_serial.c
+++ b/arch/arm/src/stm32l4/stm32l4_serial.c
@@ -1877,12 +1877,12 @@ static int stm32l4serial_ioctl(FAR struct file *filep, int cmd,
                                  SER_SINGLEWIRE_PUSHPULL ?
                                  GPIO_PUSHPULL : GPIO_OPENDRAIN;
             gpio_val |=
-                (arg & SER_SINGLEWIRE_PULL_MASK) == SER_SINGLEWIRE_PULLUP ?
-                  GPIO_PULLUP : GPIO_FLOAT;
+              (arg & SER_SINGLEWIRE_PULL_MASK) == SER_SINGLEWIRE_PULLUP ?
+                                                  GPIO_PULLUP : GPIO_FLOAT;
 
             gpio_val |=
-                (arg & SER_SINGLEWIRE_PULL_MASK) == SER_SINGLEWIRE_PULLDOWN ?
-                  GPIO_PULLDOWN : GPIO_FLOAT;
+              (arg & SER_SINGLEWIRE_PULL_MASK) == SER_SINGLEWIRE_PULLDOWN ?
+                                                  GPIO_PULLDOWN : GPIO_FLOAT;
 
             stm32l4_configgpio((priv->tx_gpio & ~(GPIO_PUPD_MASK |
                                                   GPIO_OPENDRAIN)) |