diff --git a/include/boost/fusion/container/vector/vector.hpp b/include/boost/fusion/container/vector/vector.hpp
index df306714..fb6a6f8b 100644
--- a/include/boost/fusion/container/vector/vector.hpp
+++ b/include/boost/fusion/container/vector/vector.hpp
@@ -36,7 +36,6 @@
 #include <boost/core/enable_if.hpp>
 #include <boost/mpl/int.hpp>
 #include <boost/mpl/bool.hpp>
-#include <boost/type_traits/declval.hpp>
 #include <boost/type_traits/is_same.hpp>
 #include <boost/type_traits/is_convertible.hpp>
 #include <boost/type_traits/remove_cv.hpp>
@@ -272,8 +271,8 @@ namespace boost { namespace fusion
             }
 
             template <std::size_t N, typename U>
-            static BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-            U value_at_impl(store<N, U>*) { return boost::declval<U>(); }
+            static BOOST_FUSION_GPU_ENABLED
+            U value_at_impl(store<N, U>*);
         };
 
         template <typename V, typename... T>
diff --git a/include/boost/fusion/view/detail/strictest_traversal.hpp b/include/boost/fusion/view/detail/strictest_traversal.hpp
index d1aa7883..4092ea4d 100644
--- a/include/boost/fusion/view/detail/strictest_traversal.hpp
+++ b/include/boost/fusion/view/detail/strictest_traversal.hpp
@@ -17,9 +17,6 @@
 #include <boost/fusion/algorithm/iteration/fold.hpp>
 #include <boost/type_traits/remove_reference.hpp>
 #include <boost/type_traits/is_convertible.hpp>
-#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
-#include <boost/type_traits/declval.hpp>
-#endif
 
 namespace boost { namespace fusion
 {
@@ -62,12 +59,9 @@ namespace boost { namespace fusion
             // never called, but needed for decltype-based result_of (C++0x)
 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
             template<typename StrictestSoFar, typename Next>
-            BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+            BOOST_FUSION_GPU_ENABLED
             typename result<strictest_traversal_impl(StrictestSoFar, Next)>::type
-            operator()(StrictestSoFar&&, Next&&) const
-            {
-                return boost::declval<typename result<strictest_traversal_impl(StrictestSoFar, Next)>::type>();
-            }
+            operator()(StrictestSoFar&&, Next&&) const;
 #endif
         };