diff --git a/platforms/nuttx/nuttx-configs/px4fmu-v5/nsh/defconfig b/platforms/nuttx/nuttx-configs/px4fmu-v5/nsh/defconfig
index 86b43da44e..2a9af522c0 100644
--- a/platforms/nuttx/nuttx-configs/px4fmu-v5/nsh/defconfig
+++ b/platforms/nuttx/nuttx-configs/px4fmu-v5/nsh/defconfig
@@ -871,7 +871,7 @@ CONFIG_USART2_OFLOWCONTROL=y
 # USART3 Configuration
 #
 CONFIG_USART3_RXBUFSIZE=600
-CONFIG_USART3_TXBUFSIZE=1500
+CONFIG_USART3_TXBUFSIZE=3000
 CONFIG_USART3_BAUD=57600
 CONFIG_USART3_BITS=8
 CONFIG_USART3_PARITY=0