Index: boost/regex/v4/basic_regex.hpp
===================================================================
--- boost/regex/v4/basic_regex.hpp	(revision 53220)
+++ boost/regex/v4/basic_regex.hpp	(working copy)
@@ -69,6 +69,7 @@
 {
 public:
    virtual int get_id(const charT* i, const charT* j) = 0;
+   virtual ~named_subexpressions_base() {}
 };
 
 template <class charT>