diff --git a/configs/evb-px5_defconfig b/configs/evb-px5_defconfig
index dae5094443a..72e492faaa5 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"
diff --git a/configs/geekbox_defconfig b/configs/geekbox_defconfig
index a1944b4ccf3..0fd89d23e49 100644
--- a/configs/geekbox_defconfig
+++ b/configs/geekbox_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_ROCKCHIP=y
+CONFIG_SYS_MALLOC_F_LEN=0x1000
 CONFIG_ROCKCHIP_RK3368=y
 CONFIG_TARGET_GEEKBOX=y
 CONFIG_DEFAULT_DEVICE_TREE="rk3368-geekbox"
diff --git a/configs/sheep-rk3368_defconfig b/configs/sheep-rk3368_defconfig
index be00fade7e0..da6b93a28c2 100644
--- a/configs/sheep-rk3368_defconfig
+++ b/configs/sheep-rk3368_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_ROCKCHIP=y
+CONFIG_SYS_MALLOC_F_LEN=0x1000
 CONFIG_ROCKCHIP_RK3368=y
 CONFIG_DEFAULT_DEVICE_TREE="rk3368-sheep"
 CONFIG_DEBUG_UART=y