diff --git a/include/boost/regex/v4/cpp_regex_traits.hpp b/include/boost/regex/v4/cpp_regex_traits.hpp
index e4eaf7c8..dbec293c 100644
--- a/include/boost/regex/v4/cpp_regex_traits.hpp
+++ b/include/boost/regex/v4/cpp_regex_traits.hpp
@@ -41,6 +41,7 @@
 
 #include <istream>
 #include <ios>
+#include <climits>
 
 #ifdef BOOST_MSVC
 #pragma warning(push)