diff --git a/configs/evb-px5_defconfig b/configs/evb-px5_defconfig
index dae5094..72e492f 100644
--- a/configs/evb-px5_defconfig
+++ b/configs/evb-px5_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_ROCKCHIP=y
+CONFIG_SYS_MALLOC_F_LEN=0x1000
 CONFIG_ROCKCHIP_RK3368=y
 CONFIG_TARGET_EVB_PX5=y
 CONFIG_DEFAULT_DEVICE_TREE="rk3368-px5-evb"