Index: invoke.hpp
===================================================================
--- invoke.hpp	(revision 64741)
+++ invoke.hpp	(working copy)
@@ -41,6 +41,7 @@
 #include <boost/utility/result_of.hpp>
 
 #include <boost/fusion/support/category_of.hpp>
+#include <boost/fusion/support/detail/access.hpp>
 #include <boost/fusion/sequence/intrinsic/at.hpp>
 #include <boost/fusion/sequence/intrinsic/size.hpp>
 #include <boost/fusion/sequence/intrinsic/front.hpp>
@@ -195,7 +196,9 @@
         public:
 
             typedef typename boost::result_of<
-#define M(z,j,data) typename result_of::at_c<Sequence,j>::type
+#define M(z,j,data) typename detail::call_param< \
+                        typename result_of::at_c<Sequence,j>::type \
+                    >::type
                     Function(BOOST_PP_ENUM(N,M,~)) >::type result_type;
 #undef M