diff --git a/target/d211/demo128_nand/image_cfg.json b/target/d211/demo128_nand/image_cfg.json
index 26cbac812..929620ad9 100644
--- a/target/d211/demo128_nand/image_cfg.json
+++ b/target/d211/demo128_nand/image_cfg.json
@@ -13,7 +13,7 @@
 			"kernel":   { "size": "12m" },
 			"recovery": { "size": "16m" },
 			"ubiroot":  {
-				"size": "64m",
+				"size": "40m",
 				"ubi": { // Volume in UBI device
 					"rootfs": { "size": "-" },
 				},