diff --git a/doc/Attic/history.html b/doc/Attic/history.html
index ed9b467c..4ffc9d23 100644
--- a/doc/Attic/history.html
+++ b/doc/Attic/history.html
@@ -42,7 +42,10 @@
             repeat more times than their maximum value.</LI>
          <LI>
             Fixed the value returned by basic_regex&lt;&gt;::empty() from a default 
-            constructed object.</LI></UL>
+            constructed object.</LI>
+         <LI>
+            Changed the deffinition of regex_error to make it backwards compatible with 
+            Boost-1.32.0.</LI></UL>
       <P>Boost 1.33.0.</P>
       <UL>
          <LI>
diff --git a/doc/history.html b/doc/history.html
index ed9b467c..4ffc9d23 100644
--- a/doc/history.html
+++ b/doc/history.html
@@ -42,7 +42,10 @@
             repeat more times than their maximum value.</LI>
          <LI>
             Fixed the value returned by basic_regex&lt;&gt;::empty() from a default 
-            constructed object.</LI></UL>
+            constructed object.</LI>
+         <LI>
+            Changed the deffinition of regex_error to make it backwards compatible with 
+            Boost-1.32.0.</LI></UL>
       <P>Boost 1.33.0.</P>
       <UL>
          <LI>
diff --git a/include/boost/regex/pattern_except.hpp b/include/boost/regex/pattern_except.hpp
index ffd9b1a1..25cab1cc 100644
--- a/include/boost/regex/pattern_except.hpp
+++ b/include/boost/regex/pattern_except.hpp
@@ -40,7 +40,7 @@ namespace boost{
    class BOOST_REGEX_DECL regex_error : public std::runtime_error
 {
 public:
-   explicit regex_error(const std::string& s, regex_constants::error_type err, std::ptrdiff_t pos);
+   explicit regex_error(const std::string& s, regex_constants::error_type err = regex_constants::error_unknown, std::ptrdiff_t pos = 0);
    explicit regex_error(regex_constants::error_type err);
    ~regex_error() throw();
    regex_constants::error_type code()const