diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 10686b494f0a..63bf68e0b006 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3702,6 +3702,11 @@ static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
 	if (IS_ERR(sa))
 		return PTR_ERR(sa);
 
+	if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
 	if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
 		ret = mnt_want_write_file(file);
 		if (ret)
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 2c39d15a2beb..e65300d63d7c 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -181,6 +181,7 @@ struct btrfs_scrub_progress {
 };
 
 #define BTRFS_SCRUB_READONLY	1
+#define BTRFS_SCRUB_SUPPORTED_FLAGS	(BTRFS_SCRUB_READONLY)
 struct btrfs_ioctl_scrub_args {
 	__u64 devid;				/* in */
 	__u64 start;				/* in */