diff --git a/boards/atl/mantis-edu/nuttx-config/nsh/defconfig b/boards/atl/mantis-edu/nuttx-config/nsh/defconfig
index 56a91a680e..b196b71d28 100644
--- a/boards/atl/mantis-edu/nuttx-config/nsh/defconfig
+++ b/boards/atl/mantis-edu/nuttx-config/nsh/defconfig
@@ -204,7 +204,7 @@ CONFIG_TASK_NAME_SIZE=24
 CONFIG_UART4_BAUD=57600
 CONFIG_UART4_RXBUFSIZE=600
 CONFIG_UART4_RXDMA=y
-CONFIG_UART4_TXBUFSIZE=1500
+CONFIG_UART4_TXBUFSIZE=3000
 CONFIG_UART7_BAUD=57600
 CONFIG_UART7_RXBUFSIZE=600
 CONFIG_UART7_TXBUFSIZE=1500