diff --git a/include/boost/regex/concepts.hpp b/include/boost/regex/concepts.hpp
index 0f5677a2..97c77978 100644
--- a/include/boost/regex/concepts.hpp
+++ b/include/boost/regex/concepts.hpp
@@ -368,8 +368,6 @@ struct BaseRegexConcept
 
       // access:
       const Regex ce;
-      bool b = ce.empty();
-      ignore_unused_variable_warning(b);
       unsigned i = ce.mark_count();
       ignore_unused_variable_warning(i);
       m_flags = ce.flags();
@@ -806,6 +804,8 @@ struct BoostRegexConcept
       ignore_unused_variable_warning(i2);
       bool b = ce == ce2;
       ignore_unused_variable_warning(b);
+      b = ce.empty();
+      ignore_unused_variable_warning(b);
       b = ce != ce2;
       ignore_unused_variable_warning(b);
       b = ce < ce2;