1 files changed, 1 insertions, 1 deletions
diff --git a/ioctl.h b/ioctl.h
index cab9ec2d..7c808077 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -94,7 +94,7 @@ struct btrfs_ioctl_vol_args_v2 {
 	};
 	union {
 		char name[BTRFS_SUBVOL_NAME_MAX + 1];
-		u64 devid;
+		__u64 devid;
 	};
 };