diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 92424a22d8d68..012fbfdfbebf2 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3986,6 +3986,10 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
 	bool need_unlock; /* for mut. excl. ops lock */
 	int ret;
 
+	if (!arg)
+		btrfs_warn(fs_info,
+	"IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18");
+
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;