diff --git a/config/Config-images.in b/config/Config-images.in
index 12d57927852b38..bb1625947848ab 100644
--- a/config/Config-images.in
+++ b/config/Config-images.in
@@ -312,8 +312,8 @@ menu "Target Images"
 		int "Root filesystem partition size (in MiB)"
 		depends on USES_ROOTFS_PART || TARGET_ROOTFS_EXT4FS
 		default 232 if TARGET_loongarch64
-		default 448 if TARGET_mediatek || TARGET_x86
-		default 160
+		default 640 if TARGET_mediatek || TARGET_x86
+		default 640
 		help
 		  Select the root filesystem partition size.