diff --git a/include/boost/python/cast.hpp b/include/boost/python/cast.hpp
index 31c61dbf..bad7e282 100755
--- a/include/boost/python/cast.hpp
+++ b/include/boost/python/cast.hpp
@@ -70,7 +70,7 @@ namespace detail
   template <class T>
   inline void assert_castable(boost::type<T>* = 0)
   {
-      typedef char must_be_a_complete_type[sizeof(T)];
+      typedef char must_be_a_complete_type[sizeof(T)] BOOST_ATTRIBUTE_UNUSED;
   }
 
   template <class Source, class Target>
diff --git a/include/boost/python/make_function.hpp b/include/boost/python/make_function.hpp
index f2f2a9e5..7dd7c316 100644
--- a/include/boost/python/make_function.hpp
+++ b/include/boost/python/make_function.hpp
@@ -55,7 +55,7 @@ namespace detail
       
       typedef typename detail::error::more_keywords_than_function_arguments<
           NumKeywords::value, arity
-          >::too_many_keywords assertion;
+          >::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;
     
       return objects::function_object(
           detail::caller<F,CallPolicies,Sig>(f, p)
diff --git a/include/boost/python/object/pickle_support.hpp b/include/boost/python/object/pickle_support.hpp
index cbdbcbb9..aa96d655 100644
--- a/include/boost/python/object/pickle_support.hpp
+++ b/include/boost/python/object/pickle_support.hpp
@@ -107,7 +107,7 @@ namespace detail {
     {
       typedef typename
         error_messages::missing_pickle_suite_function_or_incorrect_signature<
-          Class_>::error_type error_type;
+          Class_>::error_type error_type BOOST_ATTRIBUTE_UNUSED;
     }
   };