diff --git a/nuttx-configs/px4fmu-v2/nsh/defconfig b/nuttx-configs/px4fmu-v2/nsh/defconfig
index 59abc22fb6..8f6af5d6b4 100644
--- a/nuttx-configs/px4fmu-v2/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v2/nsh/defconfig
@@ -551,8 +551,8 @@ CONFIG_UART7_SERIAL_CONSOLE=y
 #
 # USART1 Configuration
 #
-CONFIG_USART1_RXBUFSIZE=600
-CONFIG_USART1_TXBUFSIZE=600
+CONFIG_USART1_RXBUFSIZE=128
+CONFIG_USART1_TXBUFSIZE=32
 CONFIG_USART1_BAUD=115200
 CONFIG_USART1_BITS=8
 CONFIG_USART1_PARITY=0