diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 5956ffa434e..e5c07bc59a0 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2013-10-23  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR libstdc++/58850
+	* include/std/chrono (minutes, hours): Change typedefs to uniformly
+	use int64_t.
+	* testsuite/20_util/duration/arithmetic/58850.cc: New.
+
 2013-10-23  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* testsuite/decimal/pr58815.cc: Fix thinko.
diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono
index deeb460433d..b4ccca985ef 100644
--- a/libstdc++-v3/include/std/chrono
+++ b/libstdc++-v3/include/std/chrono
@@ -524,22 +524,22 @@ _GLIBCXX_END_NAMESPACE_VERSION
       { return !(__lhs < __rhs); }
 
     /// nanoseconds
-    typedef duration<int64_t, nano> 	nanoseconds;
+    typedef duration<int64_t, nano> 	    nanoseconds;
 
     /// microseconds
-    typedef duration<int64_t, micro> 	microseconds;
+    typedef duration<int64_t, micro> 	    microseconds;
 
     /// milliseconds
-    typedef duration<int64_t, milli> 	milliseconds;
+    typedef duration<int64_t, milli> 	    milliseconds;
 
     /// seconds
-    typedef duration<int64_t> 		seconds;
+    typedef duration<int64_t> 		    seconds;
 
     /// minutes
-    typedef duration<int, ratio< 60>> 	minutes;
+    typedef duration<int64_t, ratio< 60>>   minutes;
 
     /// hours
-    typedef duration<int, ratio<3600>> 	hours;
+    typedef duration<int64_t, ratio<3600>>  hours;
 
     /// time_point
     template<typename _Clock, typename _Dur>
diff --git a/libstdc++-v3/testsuite/20_util/duration/arithmetic/58850.cc b/libstdc++-v3/testsuite/20_util/duration/arithmetic/58850.cc
new file mode 100644
index 00000000000..2a208b19d93
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/arithmetic/58850.cc
@@ -0,0 +1,42 @@
+// { dg-options "-std=gnu++11" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2013 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+
+  typedef duration<std::int64_t, std::ratio<36 * 24 * 36525>> Years;
+  Years galactic_empire_age( 12067 );
+
+  VERIFY( duration_cast<seconds>( galactic_empire_age ).count()
+	  == duration_cast<minutes>( galactic_empire_age ).count() * 60 );
+  VERIFY( duration_cast<minutes>( galactic_empire_age ).count()
+	  == duration_cast<seconds>( galactic_empire_age ).count() / 60 );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}