Index: boost/serialization/collection_traits.hpp
===================================================================
--- boost/serialization/collection_traits.hpp	(revision 44427)
+++ boost/serialization/collection_traits.hpp	(working copy)
@@ -29,6 +29,8 @@
 #include <boost/cstdint.hpp>
 #include <boost/serialization/level.hpp>
 
+#include <climits> // ULONG_MAX
+
 #define BOOST_SERIALIZATION_COLLECTION_TRAITS_HELPER(T, C)          \
 template<>                                                          \
 struct implementation_level< C < T > > {                            \