diff --git a/ioctl.h b/ioctl.h
index 6670e08a..023ca4c0 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -281,6 +281,13 @@ struct btrfs_ioctl_logical_ino_args {
 				   struct btrfs_ioctl_vol_args)
 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 				   struct btrfs_ioctl_vol_args)
+
+struct btrfs_ioctl_clone_range_args {
+	__s64 src_fd;
+	__u64 src_offset, src_length;
+	__u64 dest_offset;
+};
+
 /* trans start and trans end are dangerous, and only for
  * use by applications that know how to avoid the
  * resulting deadlocks
@@ -296,7 +303,8 @@ struct btrfs_ioctl_logical_ino_args {
 				   struct btrfs_ioctl_vol_args)
 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 				   struct btrfs_ioctl_vol_args)
-/* 13 is for CLONE_RANGE */
+#define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
+				   struct btrfs_ioctl_clone_range_args)
 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 				   struct btrfs_ioctl_vol_args)
 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \