diff --git a/include/boost/regex/regex_traits.hpp b/include/boost/regex/regex_traits.hpp
index 8de2283e..41ba666b 100644
--- a/include/boost/regex/regex_traits.hpp
+++ b/include/boost/regex/regex_traits.hpp
@@ -48,12 +48,12 @@ BOOST_REGEX_DECL bool BOOST_REGEX_CALL re_lookup_def_collate_name(std::string& b
 BOOST_REGEX_DECL std::size_t BOOST_REGEX_CALL re_get_default_message(char* buf, std::size_t len, std::size_t id);
 extern BOOST_REGEX_DECL const char *re_default_error_messages[];
 BOOST_REGEX_DECL bool BOOST_REGEX_CALL re_lookup_def_collate_name(std::string& buf, const char* name);
-BOOST_REGEX_DECL bool BOOST_REGEX_CALL is_combining(wchar_t c);
 //extern BOOST_REGEX_DECL const wchar_t combining_ranges[];
 
 #ifndef BOOST_NO_WREGEX
 extern BOOST_REGEX_DECL wchar_t wide_lower_case_map[];
 extern BOOST_REGEX_DECL unsigned short wide_unicode_classes[];
+BOOST_REGEX_DECL bool BOOST_REGEX_CALL is_combining(wchar_t c);
 #endif