diff --git a/configs/evb-ast2500_defconfig b/configs/evb-ast2500_defconfig
index 5abb56e..3dab945 100644
--- a/configs/evb-ast2500_defconfig
+++ b/configs/evb-ast2500_defconfig
@@ -6,6 +6,7 @@
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x20000
+CONFIG_SYS_MALLOC_LEN=0x2000000
 CONFIG_DEFAULT_DEVICE_TREE="ast2500-evb"
 CONFIG_PRE_CON_BUF_ADDR=0x1e720000
 CONFIG_SYS_LOAD_ADDR=0x83000000