diff --git a/nuttx/configs/px4fmu/nsh/defconfig b/nuttx/configs/px4fmu/nsh/defconfig
index d669da83ab..fd783dec5d 100755
--- a/nuttx/configs/px4fmu/nsh/defconfig
+++ b/nuttx/configs/px4fmu/nsh/defconfig
@@ -200,6 +200,12 @@ CONFIG_STM32_TIM9=y
 CONFIG_STM32_TIM10=y
 CONFIG_STM32_TIM11=y
 
+#
+# Enable single wire support.  If this is not defined, then this mode cannot
+# be enabled.
+#
+CONFIG_STM32_USART_SINGLEWIRE=y
+
 #
 # We want the flash prefetch on for max performance.
 #
@@ -226,8 +232,6 @@ CONFIG_AT24XX_MTD_BLOCKSIZE=256
 # CONFIG_SERIAL_CONSOLE_REINIT - re-initializes the console serial port
 #   immediately after creating the /dev/console device.  This is required
 #   if the console serial port has RX DMA enabled.
-# CONFIG_STM32_USART_SINGLEWIRE - Serial driver supports single wire mode.  If
-#   this is not defined, then this mode cannot be enabled.
 #
 # CONFIG_USARTn_SERIAL_CONSOLE - selects the USARTn for the
 #   console and ttys0 (default is the USART1).
@@ -242,7 +246,6 @@ CONFIG_AT24XX_MTD_BLOCKSIZE=256
 #
 CONFIG_SERIAL_TERMIOS=y
 CONFIG_SERIAL_CONSOLE_REINIT=y
-CONFIG_STM32_USART_SINGLEWIRE=y
 
 CONFIG_USART1_SERIAL_CONSOLE=y
 CONFIG_USART2_SERIAL_CONSOLE=n