diff --git a/configs/M5253DEMO_defconfig b/configs/M5253DEMO_defconfig
index 603487b..ff4142b 100644
--- a/configs/M5253DEMO_defconfig
+++ b/configs/M5253DEMO_defconfig
@@ -2,6 +2,7 @@
 CONFIG_SYS_TEXT_BASE=0xFF800000
 CONFIG_ENV_SIZE=0x1000
 CONFIG_ENV_SECT_SIZE=0x1000
+CONFIG_SYS_MALLOC_LEN=0x40000
 CONFIG_DEFAULT_DEVICE_TREE="M5253DEMO"
 CONFIG_TARGET_M5253DEMO=y
 CONFIG_SYS_LOAD_ADDR=0x100000