--- /dev/null
+--- a/include/ostream
++++ b/include/ostream
+@@ -294,7 +294,7 @@ namespace std {
+ #endif
+ #endif
+
+- template <class charT,class traits = char_traits<charT> >
++ template <class charT,class traits>
+ class _UCXXEXPORT basic_ostream<charT,traits>::sentry
+ {
+ bool ok;
+--- a/include/istream
++++ b/include/istream
+@@ -340,7 +340,7 @@ namespace std{
+
+ };
+
+- template <class charT,class traits = char_traits<charT> > class _UCXXEXPORT basic_istream<charT,traits>::sentry {
++ template <class charT,class traits> class _UCXXEXPORT basic_istream<charT,traits>::sentry {
+ bool ok;
+ public:
+ explicit _UCXXEXPORT sentry(basic_istream<charT,traits>& os, bool noskipws = false){