diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9f1efd5c24f1..f2651a909925 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3102,6 +3102,10 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
 				kfree(range);
 				goto out;
 			}
+			if (range->flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
+				ret = -EOPNOTSUPP;
+				goto out;
+			}
 			/* compression requires us to start the IO */
 			if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
 				range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 72cd9f61f054..140722320698 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -539,6 +539,9 @@ struct btrfs_ioctl_clone_range_args {
  */
 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 #define BTRFS_DEFRAG_RANGE_START_IO 2
+#define BTRFS_DEFRAG_RANGE_FLAGS_SUPP	(BTRFS_DEFRAG_RANGE_COMPRESS |		\
+					 BTRFS_DEFRAG_RANGE_START_IO)
+
 struct btrfs_ioctl_defrag_range_args {
 	/* start of the defrag operation */
 	__u64 start;