diff --git a/include/boost/regex/concepts.hpp b/include/boost/regex/concepts.hpp
index 5b00ec78..864bed24 100644
--- a/include/boost/regex/concepts.hpp
+++ b/include/boost/regex/concepts.hpp
@@ -738,6 +738,7 @@ struct RegexConcept
    RegexConcept& operator=(const RegexConcept&);
 };
 
+#ifndef BOOST_REGEX_TEST_STD
 //
 // BoostRegexConcept:
 // Test every interface in the Boost implementation:
@@ -850,6 +851,8 @@ struct BoostRegexConcept
    BoostRegexConcept& operator=(const BoostRegexConcept&);
 };
 
+#endif // BOOST_REGEX_TEST_STD
+
 }
 
 #endif