diff --git a/include/boost/utility/result_of.hpp b/include/boost/utility/result_of.hpp
index 72d9ff2..f0e084a 100644
--- a/include/boost/utility/result_of.hpp
+++ b/include/boost/utility/result_of.hpp
@@ -71,15 +71,14 @@ template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_im
 struct result_of_private_type {};
 
 struct result_of_weird_type {
-  template<typename T>
-  friend result_of_weird_type operator,(T const &, result_of_weird_type);
   friend result_of_private_type operator,(result_of_private_type, result_of_weird_type);
 };
 
 typedef char result_of_yes_type;      // sizeof(result_of_yes_type) == 1
 typedef char (&result_of_no_type)[2]; // sizeof(result_of_no_type)  == 2
 
-result_of_no_type result_of_is_private_type(result_of_weird_type);
+template<typename T>
+result_of_no_type result_of_is_private_type(T const &);
 result_of_yes_type result_of_is_private_type(result_of_private_type);
 
 template<typename C>