diff --git a/configs/at91sam9x5ek_dataflash_defconfig b/configs/at91sam9x5ek_dataflash_defconfig
index 5fc9300..dfbac62 100644
--- a/configs/at91sam9x5ek_dataflash_defconfig
+++ b/configs/at91sam9x5ek_dataflash_defconfig
@@ -8,6 +8,7 @@
 CONFIG_ENV_SIZE=0x4200
 CONFIG_ENV_OFFSET=0x4200
 CONFIG_ENV_SECT_SIZE=0x210
+CONFIG_SYS_MALLOC_LEN=0x81000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="at91sam9g35ek"
 CONFIG_DEBUG_UART_BOARD_INIT=y