diff --git a/configs/imx6ul_isiot_mmc_defconfig b/configs/imx6ul_isiot_mmc_defconfig
index 0a990d7..367dfa1 100644
--- a/configs/imx6ul_isiot_mmc_defconfig
+++ b/configs/imx6ul_isiot_mmc_defconfig
@@ -40,3 +40,4 @@
 CONFIG_PINCTRL_IMX6=y
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
+CONFIG_SYS_MALLOC_F_LEN=0x2000