diff --git a/include/random b/include/random
index 64382a3d9..c8341efa4 100644
--- a/include/random
+++ b/include/random
@@ -6044,9 +6044,6 @@ basic_istream<_CharT, _Traits>&
 operator>>(basic_istream<_CharT, _Traits>& __is,
            discrete_distribution<_IT>& __x)
 {
-    typedef discrete_distribution<_IT> _Eng;
-    typedef typename _Eng::result_type result_type;
-    typedef typename _Eng::param_type param_type;
     __save_flags<_CharT, _Traits> __lx(__is);
     __is.flags(ios_base::dec | ios_base::skipws);
     size_t __n;
@@ -6358,7 +6355,6 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 {
     typedef piecewise_constant_distribution<_RT> _Eng;
     typedef typename _Eng::result_type result_type;
-    typedef typename _Eng::param_type param_type;
     __save_flags<_CharT, _Traits> __lx(__is);
     __is.flags(ios_base::dec | ios_base::skipws);
     size_t __n;
@@ -6698,7 +6694,6 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 {
     typedef piecewise_linear_distribution<_RT> _Eng;
     typedef typename _Eng::result_type result_type;
-    typedef typename _Eng::param_type param_type;
     __save_flags<_CharT, _Traits> __lx(__is);
     __is.flags(ios_base::dec | ios_base::skipws);
     size_t __n;
diff --git a/include/regex b/include/regex
index bd48fb8da..f8e57f42c 100644
--- a/include/regex
+++ b/include/regex
@@ -4065,7 +4065,6 @@ basic_regex<_CharT, _Traits>::__parse_collating_symbol(_ForwardIterator __first,
         throw regex_error(regex_constants::error_brack);
 #endif  // _LIBCPP_NO_EXCEPTIONS
     // [__first, __temp) contains all text in [. ... .]
-    typedef typename _Traits::string_type string_type;
     __col_sym = __traits_.lookup_collatename(__first, __temp);
     switch (__col_sym.size())
     {