diff --git a/trainer.h b/trainer.h
index bc514ed43375930356065d2536a44991894dfb88..7a1eece225c1813d49635040f641a45b32dee149 100644
--- a/trainer.h
+++ b/trainer.h
@@ -279,5 +279,6 @@ class MPI_Trainer_HOST {
   public:
   MPI_Trainer_HOST(MPI_Trainer &MPIT):
     MPIT(MPIT)
+  {}
 };
 #endif