diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 74706b6aa747..87197d13cc76 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2271,6 +2271,11 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
 		error = -EINVAL;
 		goto out_fmt;
 	}
+	/* Filesystems outside of init_user_ns not yet supported */
+	if (sb->s_user_ns != &init_user_ns) {
+		error = -EINVAL;
+		goto out_fmt;
+	}
 	/* Usage always has to be set... */
 	if (!(flags & DQUOT_USAGE_ENABLED)) {
 		error = -EINVAL;