diff --git a/configs/xtfpga_defconfig b/configs/xtfpga_defconfig
index 367e8f0..5de17c6 100644
--- a/configs/xtfpga_defconfig
+++ b/configs/xtfpga_defconfig
@@ -1,6 +1,7 @@
 CONFIG_XTENSA=y
 CONFIG_SYS_CPU="dc233c"
 CONFIG_SYS_MALLOC_LEN=0x40000
+CONFIG_SYS_MALLOC_F_LEN=0x400
 CONFIG_ENV_SIZE=0x20000
 CONFIG_ENV_SECT_SIZE=0x20000
 CONFIG_SYS_LOAD_ADDR=0x02000000