diff --git a/configs/alt_defconfig b/configs/alt_defconfig
index 84d8f2e..ed4d448 100644
--- a/configs/alt_defconfig
+++ b/configs/alt_defconfig
@@ -12,6 +12,7 @@
 CONFIG_ENV_SIZE=0x40000
 CONFIG_ENV_OFFSET=0xC0000
 CONFIG_ENV_SECT_SIZE=0x40000
+CONFIG_SYS_MALLOC_LEN=0x100000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="r8a7794-alt-u-boot"
 CONFIG_SPL_TEXT_BASE=0xe6300000