diff --git a/fs/sdcardfs/main.c b/fs/sdcardfs/main.c
index 1a977493f88d..30e0c431a1ea 100644
--- a/fs/sdcardfs/main.c
+++ b/fs/sdcardfs/main.c
@@ -361,6 +361,7 @@ static int sdcardfs_read_super(struct vfsmount *mnt, struct super_block *sb,
 	/* no longer needed: free_dentry_private_data(sb->s_root); */
 out_freeroot:
 	dput(sb->s_root);
+	sb->s_root = NULL;
 out_sput:
 	/* drop refs we took earlier */
 	atomic_dec(&lower_sb->s_active);