diff --git a/arch/arm/configs/rockchip_defconfig b/arch/arm/configs/rockchip_defconfig
index 0072825b66ba..fb09a215b1a2 100644
--- a/arch/arm/configs/rockchip_defconfig
+++ b/arch/arm/configs/rockchip_defconfig
@@ -234,6 +234,7 @@ CONFIG_DEVTMPFS=y
 CONFIG_FW_LOADER_USER_HELPER=y
 CONFIG_DMA_CMA=y
 CONFIG_ZRAM=y
+CONFIG_ZRAM_WRITEBACK=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=8192