diff --git a/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig b/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig
index 04b4b29fa20..fbc64639b46 100644
--- a/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig
+++ b/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig
@@ -6,6 +6,7 @@
 # modifications.
 #
 # CONFIG_ARCH_RAMFUNCS is not set
+# CONFIG_LIBC_TEMPBUFFER is not set
 # CONFIG_MMCSD_HAVE_CARDDETECT is not set
 # CONFIG_MMCSD_MMCSUPPORT is not set
 # CONFIG_NSH_DISABLE_IFCONFIG is not set