diff --git a/configs/nsa310s_defconfig b/configs/nsa310s_defconfig
index d003b7e..e4902d4 100644
--- a/configs/nsa310s_defconfig
+++ b/configs/nsa310s_defconfig
@@ -5,6 +5,7 @@
 CONFIG_ARCH_KIRKWOOD=y
 CONFIG_SYS_KWD_CONFIG="board/zyxel/nsa310s/kwbimage.cfg"
 CONFIG_SYS_TEXT_BASE=0x600000
+CONFIG_SYS_MALLOC_F_LEN=0x400
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_TARGET_NSA310S=y
 CONFIG_ENV_SIZE=0x20000