diff --git a/include/boost/fusion/algorithm/auxiliary/copy.hpp b/include/boost/fusion/algorithm/auxiliary/copy.hpp
index eec8e019..e6e4f80f 100644
--- a/include/boost/fusion/algorithm/auxiliary/copy.hpp
+++ b/include/boost/fusion/algorithm/auxiliary/copy.hpp
@@ -43,7 +43,7 @@ namespace boost { namespace fusion
             }
 
             template <typename I1, typename I2>
-            static bool
+            static void
             call(I1 const& src, I2 const& dest)
             {
                 typename result_of::equal_to<I1, end1_type>::type eq;