diff --git a/configs/kmnusa_defconfig b/configs/kmnusa_defconfig
index 3fc6413..b385591 100644
--- a/configs/kmnusa_defconfig
+++ b/configs/kmnusa_defconfig
@@ -5,6 +5,7 @@
 CONFIG_ARCH_KIRKWOOD=y
 CONFIG_SYS_KWD_CONFIG="board/keymile/km_arm/kwbimage_128M16_1.cfg"
 CONFIG_SYS_TEXT_BASE=0x07d00000
+CONFIG_SYS_MALLOC_F_LEN=0x400
 CONFIG_TARGET_KM_KIRKWOOD=y
 CONFIG_ENV_SIZE=0x2000
 CONFIG_ENV_OFFSET=0xC0000