diff --git a/include/boost/numeric/ublas/fwd.hpp b/include/boost/numeric/ublas/fwd.hpp
index e5054798..39e937af 100644
--- a/include/boost/numeric/ublas/fwd.hpp
+++ b/include/boost/numeric/ublas/fwd.hpp
@@ -50,9 +50,9 @@ namespace boost { namespace numeric { namespace ublas {
     template<class A = unbounded_array<std::size_t> >
     class indirect_array;
 
-    template<class I, class T, class ALLOC = std::allocator<T> >
+    template<class I, class T, class ALLOC = std::allocator<std::pair<const I, T> > >
     class map_std;
-    template<class I, class T, class ALLOC = std::allocator<T> >
+    template<class I, class T, class ALLOC = std::allocator<std::pair<const I, T> > >
     class map_array;
 
     struct vector_tag {};