diff --git a/nuttx/configs/px4io/io/defconfig b/nuttx/configs/px4io/io/defconfig
index e90e7ce62b..d354ebfe57 100755
--- a/nuttx/configs/px4io/io/defconfig
+++ b/nuttx/configs/px4io/io/defconfig
@@ -161,13 +161,13 @@ CONFIG_USART1_SERIAL_CONSOLE=y
 CONFIG_USART2_SERIAL_CONSOLE=n
 CONFIG_USART3_SERIAL_CONSOLE=n
 
-CONFIG_USART1_TXBUFSIZE=32
-CONFIG_USART2_TXBUFSIZE=32
-CONFIG_USART3_TXBUFSIZE=32
+CONFIG_USART1_TXBUFSIZE=64
+CONFIG_USART2_TXBUFSIZE=64
+CONFIG_USART3_TXBUFSIZE=64
 
 CONFIG_USART1_RXBUFSIZE=64
-CONFIG_USART2_RXBUFSIZE=128
-CONFIG_USART3_RXBUFSIZE=32
+CONFIG_USART2_RXBUFSIZE=64
+CONFIG_USART3_RXBUFSIZE=64
 
 CONFIG_USART1_BAUD=115200
 CONFIG_USART2_BAUD=115200