diff --git a/nuttx-configs/px4io-v2/nsh/defconfig b/nuttx-configs/px4io-v2/nsh/defconfig
index 79f2724940..5f7cf13759 100755
--- a/nuttx-configs/px4io-v2/nsh/defconfig
+++ b/nuttx-configs/px4io-v2/nsh/defconfig
@@ -646,6 +646,7 @@ CONFIG_FDCLONE_STDIO=y
 CONFIG_SDCLONE_DISABLE=y
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=0
+CONFIG_STDIO_DISABLE_BUFFERING=y
 CONFIG_NAME_MAX=12
 # CONFIG_PRIORITY_INHERITANCE is not set
 
@@ -902,7 +903,7 @@ CONFIG_MM_REGIONS=1
 #
 # Standard C Library Options
 #
-CONFIG_STDIO_BUFFER_SIZE=32
+# CONFIG_STDIO_BUFFER_SIZE is not set
 # CONFIG_STDIO_LINEBUFFER is not set
 CONFIG_NUNGET_CHARS=2
 # CONFIG_LIBC_DLLFCN is not set