diff --git a/lustre/include/obd.h b/lustre/include/obd.h
index c4ff02a0e203d91ca4074b22d2206a74f62809ab..8baea5e28d51e71f302af978b70ee8a66d36e42a 100644
--- a/lustre/include/obd.h
+++ b/lustre/include/obd.h
@@ -46,7 +46,7 @@ struct loi_oap_pages {
 struct osc_async_rc {
         int     ar_rc;
         int     ar_force_sync;
-        int     ar_min_xid;
+        __u64   ar_min_xid;
 };
 
 struct lov_oinfo {                 /* per-stripe data structure */