diff --git a/arch/arm/src/stm32/stm32_serial.c b/arch/arm/src/stm32/stm32_serial.c
index ac3fd76b142..f1fc2baf1b1 100644
--- a/arch/arm/src/stm32/stm32_serial.c
+++ b/arch/arm/src/stm32/stm32_serial.c
@@ -1913,11 +1913,12 @@ 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 c429bd5ca68..5b57549a8ef 100644
--- a/arch/arm/src/stm32f7/stm32_serial.c
+++ b/arch/arm/src/stm32f7/stm32_serial.c
@@ -1833,11 +1833,12 @@ 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 06d7ce00f45..f29a229992e 100644
--- a/arch/arm/src/stm32l4/stm32l4_serial.c
+++ b/arch/arm/src/stm32l4/stm32l4_serial.c
@@ -1576,11 +1576,12 @@ 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;