diff --git a/include/boost/fusion/algorithm/iteration/detail/fold.hpp b/include/boost/fusion/algorithm/iteration/detail/fold.hpp
index 8ca9c6e8..0757b257 100644
--- a/include/boost/fusion/algorithm/iteration/detail/fold.hpp
+++ b/include/boost/fusion/algorithm/iteration/detail/fold.hpp
@@ -186,7 +186,7 @@ namespace boost { namespace fusion
         {
             template<typename State, typename It0, typename F>
             static Result
-            call(State const& state,It0 const& it0,F f)
+            call(State const& state,It0 const& it0, F)
             {
                 return static_cast<Result>(state);
             }