diff --git a/include/boost/xpressive/regex_actions.hpp b/include/boost/xpressive/regex_actions.hpp
index 800b59b..e22b164 100644
--- a/include/boost/xpressive/regex_actions.hpp
+++ b/include/boost/xpressive/regex_actions.hpp
@@ -707,6 +707,7 @@ namespace boost { namespace xpressive
         typedef typename proto::terminal<Fun>::type type;
     };
 
+    function<op::at>::type const at = {{}};
     function<op::push>::type const push = {{}};
     function<op::push_back>::type const push_back = {{}};
     function<op::push_front>::type const push_front = {{}};
@@ -909,6 +910,7 @@ namespace boost { namespace xpressive
     {
         inline void ignore_unused_regex_actions()
         {
+            detail::ignore_unused(xpressive::at);
             detail::ignore_unused(xpressive::push);
             detail::ignore_unused(xpressive::push_back);
             detail::ignore_unused(xpressive::push_front);
@@ -925,6 +927,7 @@ namespace boost { namespace xpressive
             detail::ignore_unused(xpressive::str);
             detail::ignore_unused(xpressive::insert);
             detail::ignore_unused(xpressive::make_pair);
+            detail::ignore_unused(xpressive::unwrap_reference);
             detail::ignore_unused(xpressive::check);
             detail::ignore_unused(xpressive::let);
         }
diff --git a/include/boost/xpressive/regex_constants.hpp b/include/boost/xpressive/regex_constants.hpp
old mode 100755
new mode 100644
index fd63ff1..49be39b
--- a/include/boost/xpressive/regex_constants.hpp
+++ b/include/boost/xpressive/regex_constants.hpp
@@ -232,7 +232,7 @@ enum error_type
                                 ///<
     error_badattr,              ///< Tried to read from an uninitialized attribute.
                                 ///<
-    error_internal              ///< An internal error has occured.
+    error_internal              ///< An internal error has occurred.
                                 ///<
 };