diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 409bee3e7587..537d90bf5d84 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2362,7 +2362,7 @@ static struct file_system_type btrfs_root_fs_type = {
 	.name		= "btrfs",
 	.mount		= btrfs_mount_root,
 	.kill_sb	= btrfs_kill_super,
-	.fs_flags	= FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
+	.fs_flags	= FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP,
 };
 
 MODULE_ALIAS_FS("btrfs");