diff --git a/include/boost/lambda/detail/lambda_functors.hpp b/include/boost/lambda/detail/lambda_functors.hpp
index db229ec..9ce29ad 100644
--- a/include/boost/lambda/detail/lambda_functors.hpp
+++ b/include/boost/lambda/detail/lambda_functors.hpp
@@ -308,6 +308,12 @@ struct result_of<boost::lambda::lambda_functor<T>()>
     typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
 };
 
+template<class T>
+struct result_of<const boost::lambda::lambda_functor<T>()>
+{
+    typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
+};
+
 #endif
 
 template<class T>
@@ -316,6 +322,12 @@ struct tr1_result_of<boost::lambda::lambda_functor<T>()>
     typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
 };
 
+template<class T>
+struct tr1_result_of<const boost::lambda::lambda_functor<T>()>
+{
+    typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
+};
+
 }
 
 // is_placeholder