diff --git a/nuttx-configs/px4fmu-v4/nsh/defconfig b/nuttx-configs/px4fmu-v4/nsh/defconfig
index 90aaf6261f..f4533279d4 100644
--- a/nuttx-configs/px4fmu-v4/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v4/nsh/defconfig
@@ -552,7 +552,7 @@ CONFIG_UART7_SERIAL_CONSOLE=y
 # USART1 Configuration
 #
 CONFIG_USART1_RXBUFSIZE=600
-CONFIG_USART1_TXBUFSIZE=1100
+CONFIG_USART1_TXBUFSIZE=2000
 CONFIG_USART1_BAUD=115200
 CONFIG_USART1_BITS=8
 CONFIG_USART1_PARITY=0