diff --git a/nuttx-configs/px4fmu-v3/nsh/defconfig b/nuttx-configs/px4fmu-v3/nsh/defconfig
index 16d2734d9e..c154ab0e65 100644
--- a/nuttx-configs/px4fmu-v3/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v3/nsh/defconfig
@@ -1077,7 +1077,7 @@ CONFIG_CDCACM_NRDREQS=4
 CONFIG_CDCACM_NWRREQS=4
 CONFIG_CDCACM_BULKIN_REQLEN=96
 CONFIG_CDCACM_RXBUFSIZE=600
-CONFIG_CDCACM_TXBUFSIZE=8000
+CONFIG_CDCACM_TXBUFSIZE=2000
 CONFIG_CDCACM_VENDORID=0x26ac
 CONFIG_CDCACM_PRODUCTID=0x0011
 CONFIG_CDCACM_VENDORSTR="3D Robotics"