diff --git a/test/optional_test_ref.cpp b/test/optional_test_ref.cpp
index 2e7f3bf..08ee87e 100644
--- a/test/optional_test_ref.cpp
+++ b/test/optional_test_ref.cpp
@@ -350,7 +350,7 @@ void test_binding()
   optional<int const&> orci1 = ci ;
   BOOST_CHECK(  &(*orci1) == &ci ) ;
 	
-  optional<int const&> orci2 = ci ;
+  optional<int const&> orci2(ci) ;
   BOOST_CHECK(  &(*orci2) == &ci ) ;
 }