diff --git a/arch/arm/src/stm32/stm32_serial.c b/arch/arm/src/stm32/stm32_serial.c
index 510523f4be5..b79d72419d8 100644
--- a/arch/arm/src/stm32/stm32_serial.c
+++ b/arch/arm/src/stm32/stm32_serial.c
@@ -1914,11 +1914,12 @@ static int up_interrupt_common(struct up_dev_s *priv)
 
 static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
-#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT)
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT) \
+    || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
   struct inode      *inode = filep->f_inode;
   struct uart_dev_s *dev   = inode->i_private;
 #endif
-#ifdef CONFIG_SERIAL_TERMIOS
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
   struct up_dev_s   *priv  = (struct up_dev_s *)dev->priv;
 #endif
   int                ret    = OK;
diff --git a/arch/arm/src/stm32f7/stm32_serial.c b/arch/arm/src/stm32f7/stm32_serial.c
index ad7d80dce04..7e188690608 100644
--- a/arch/arm/src/stm32f7/stm32_serial.c
+++ b/arch/arm/src/stm32f7/stm32_serial.c
@@ -1834,11 +1834,12 @@ static int up_interrupt_common(struct up_dev_s *priv)
 
 static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
-#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT)
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT) \
+    || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
   struct inode      *inode = filep->f_inode;
   struct uart_dev_s *dev   = inode->i_private;
 #endif
-#ifdef CONFIG_SERIAL_TERMIOS
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
   struct up_dev_s   *priv  = (struct up_dev_s *)dev->priv;
 #endif
   int                ret    = OK;
diff --git a/arch/arm/src/stm32l4/stm32l4_serial.c b/arch/arm/src/stm32l4/stm32l4_serial.c
index 629ed59e153..6a9ef972d20 100644
--- a/arch/arm/src/stm32l4/stm32l4_serial.c
+++ b/arch/arm/src/stm32l4/stm32l4_serial.c
@@ -1577,11 +1577,12 @@ static int up_interrupt_common(struct up_dev_s *priv)
 
 static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
-#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT)
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT) \
+    || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
   struct inode      *inode = filep->f_inode;
   struct uart_dev_s *dev   = inode->i_private;
 #endif
-#ifdef CONFIG_SERIAL_TERMIOS
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
   struct up_dev_s   *priv  = (struct up_dev_s *)dev->priv;
 #endif
   int                ret    = OK;