diff --git a/src/libraries/turtle/action.hpp b/src/libraries/turtle/action.hpp
index 09656a4..aa8667a 100644
--- a/src/libraries/turtle/action.hpp
+++ b/src/libraries/turtle/action.hpp
@@ -44,7 +44,7 @@ namespace detail
             f_ = lambda_type::make_val( boost::ref( *r_ ) );
         }
         template< typename Y >
-        void returns( const boost::reference_wrapper< Y >& r )
+        void returns( boost::reference_wrapper< Y > r )
         {
             f_ = lambda_type::make_val( r );
         }
@@ -86,7 +86,7 @@ namespace detail
             f_ = lambda_type::make_val( r );
         }
         template< typename Y >
-        void returns( const boost::reference_wrapper< Y >& r )
+        void returns( boost::reference_wrapper< Y > r )
         {
             f_ = lambda_type::make_val( r );
         }
@@ -201,7 +201,7 @@ namespace detail
             f_ = lambda_type::make_val( boost::ref( r_ ) );
         }
         template< typename Y >
-        void set( const boost::reference_wrapper< Y >& r )
+        void set( boost::reference_wrapper< Y > r )
         {
             f_ = lambda_type::make_val( r );
             r_.reset();
diff --git a/src/libraries/turtle/log.hpp b/src/libraries/turtle/log.hpp
index bb4b606..c209b75 100644
--- a/src/libraries/turtle/log.hpp
+++ b/src/libraries/turtle/log.hpp
@@ -264,8 +264,7 @@ namespace detail
         return s;
     }
     template< typename T >
-    stream& operator<<( stream& s,
-        const boost::reference_wrapper< T >& t )
+    stream& operator<<( stream& s, boost::reference_wrapper< T > t )
     {
         return s << mock::format( t.get() );
     }