diff --git a/test/optional_test_common.cpp b/test/optional_test_common.cpp
index ff197bd..acb935c 100644
--- a/test/optional_test_common.cpp
+++ b/test/optional_test_common.cpp
@@ -152,21 +152,21 @@ bool X::pending_assign  = false ;
 bool X::throw_on_copy   = false ;
 bool X::throw_on_assign = false ;
 
-inline void set_pending_copy           ( X const* x ) { X::pending_copy  = true  ; }
-inline void set_pending_dtor           ( X const* x ) { X::pending_dtor  = true  ; }
-inline void set_pending_assign         ( X const* x ) { X::pending_assign = true  ; }
-inline void set_throw_on_copy          ( X const* x ) { X::throw_on_copy = true  ; }
-inline void set_throw_on_assign        ( X const* x ) { X::throw_on_assign = true  ; }
-inline void reset_throw_on_copy        ( X const* x ) { X::throw_on_copy = false ; }
-inline void reset_throw_on_assign      ( X const* x ) { X::throw_on_assign = false ; }
-inline void check_is_pending_copy      ( X const* x ) { BOOST_TEST( X::pending_copy ) ; }
-inline void check_is_pending_dtor      ( X const* x ) { BOOST_TEST( X::pending_dtor ) ; }
-inline void check_is_pending_assign    ( X const* x ) { BOOST_TEST( X::pending_assign ) ; }
-inline void check_is_not_pending_copy  ( X const* x ) { BOOST_TEST( !X::pending_copy ) ; }
-inline void check_is_not_pending_dtor  ( X const* x ) { BOOST_TEST( !X::pending_dtor ) ; }
-inline void check_is_not_pending_assign( X const* x ) { BOOST_TEST( !X::pending_assign ) ; }
-inline void check_instance_count       ( int c, X const* x ) { BOOST_TEST( X::count == c ) ; }
-inline int  get_instance_count         ( X const* x ) { return X::count ; }
+inline void set_pending_copy           ( X const* ) { X::pending_copy  = true  ; }
+inline void set_pending_dtor           ( X const* ) { X::pending_dtor  = true  ; }
+inline void set_pending_assign         ( X const* ) { X::pending_assign = true  ; }
+inline void set_throw_on_copy          ( X const* ) { X::throw_on_copy = true  ; }
+inline void set_throw_on_assign        ( X const* ) { X::throw_on_assign = true  ; }
+inline void reset_throw_on_copy        ( X const* ) { X::throw_on_copy = false ; }
+inline void reset_throw_on_assign      ( X const* ) { X::throw_on_assign = false ; }
+inline void check_is_pending_copy      ( X const* ) { BOOST_TEST( X::pending_copy ) ; }
+inline void check_is_pending_dtor      ( X const* ) { BOOST_TEST( X::pending_dtor ) ; }
+inline void check_is_pending_assign    ( X const* ) { BOOST_TEST( X::pending_assign ) ; }
+inline void check_is_not_pending_copy  ( X const* ) { BOOST_TEST( !X::pending_copy ) ; }
+inline void check_is_not_pending_dtor  ( X const* ) { BOOST_TEST( !X::pending_dtor ) ; }
+inline void check_is_not_pending_assign( X const* ) { BOOST_TEST( !X::pending_assign ) ; }
+inline void check_instance_count       ( int c, X const* ) { BOOST_TEST( X::count == c ) ; }
+inline int  get_instance_count         ( X const* ) { return X::count ; }
 
 inline void set_pending_copy           (...) {}
 inline void set_pending_dtor           (...) {}
diff --git a/test/optional_test_ref_fail_init_from_Trefref.cpp b/test/optional_test_ref_fail_init_from_Trefref.cpp
index 05752b8..a08c08a 100644
--- a/test/optional_test_ref_fail_init_from_Trefref.cpp
+++ b/test/optional_test_ref_fail_init_from_Trefref.cpp
@@ -10,6 +10,7 @@
 //  akrzemi1@gmail.com
 //
 #include "boost/optional.hpp"
+#include "boost/core/ignore_unused.hpp"
 
 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
 //
@@ -18,6 +19,7 @@
 void optional_reference__test_no_init_from_Trefref()
 {
   boost::optional<const int&> opt = int(3);
+  boost::ignore_unused(opt);
 }
 
 #else
diff --git a/test/optional_test_ref_fail_init_from_Urefref.cpp b/test/optional_test_ref_fail_init_from_Urefref.cpp
index e15192b..af7ca27 100644
--- a/test/optional_test_ref_fail_init_from_Urefref.cpp
+++ b/test/optional_test_ref_fail_init_from_Urefref.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2014, andrzej Krzemienski.
+// Copyright (C) 2014, 2016 andrzej Krzemienski.
 //
 // Use, modification, and distribution is subject to the Boost Software
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@@ -10,6 +10,7 @@
 //  akrzemi1@gmail.com
 //
 #include "boost/optional.hpp"
+#include "boost/core/ignore_unused.hpp"
 
 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
 //
@@ -18,6 +19,7 @@
 void optional_reference__test_no_init_from_Urefref()
 {
   boost::optional<const int&> opt = long(3);
+  boost::ignore_unused(opt);
 }
 
 #else