diff --git a/nuttx-configs/px4fmu-v1/nsh/defconfig b/nuttx-configs/px4fmu-v1/nsh/defconfig
index b6f14490e0..3e02c204e1 100644
--- a/nuttx-configs/px4fmu-v1/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v1/nsh/defconfig
@@ -564,8 +564,8 @@ CONFIG_CDCACM_EPBULKIN_HSSIZE=512
 CONFIG_CDCACM_NWRREQS=4
 CONFIG_CDCACM_NRDREQS=4
 CONFIG_CDCACM_BULKIN_REQLEN=96
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
+CONFIG_CDCACM_RXBUFSIZE=512
+CONFIG_CDCACM_TXBUFSIZE=512
 CONFIG_CDCACM_VENDORID=0x26ac
 CONFIG_CDCACM_PRODUCTID=0x0010
 CONFIG_CDCACM_VENDORSTR="3D Robotics"