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diff --git a/libstdc++-v3/testsuite/22_locale/num_put/put/wchar_t/20909.cc b/libstdc++-v3/testsuite/22_locale/num_put/put/wchar_t/20909.cc
new file mode 100644
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+++ b/libstdc++-v3/testsuite/22_locale/num_put/put/wchar_t/20909.cc
@@ -0,0 +1,79 @@
+// 2005-04-09  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2005 Free Software Foundation
+//
+// 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 22.2.2.2.1  num_put members
+
+#include <locale>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+// libstdc++/20909
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  // A locale that expects grouping.
+  locale loc_de = __gnu_test::try_named_locale("de_DE");
+
+  const wstring empty;
+  wstring result;
+
+  wostringstream oss;
+  oss.imbue(loc_de);
+  const num_put<wchar_t>& np = use_facet<num_put<wchar_t> >(oss.getloc()); 
+
+  double d0 = 2e20;
+  double d1 = -2e20;
+
+  oss.str(empty);
+  oss.clear();
+  np.put(oss.rdbuf(), oss, L'*', d0);
+  result = oss.str();
+  VERIFY( result == L"2e+20" );
+
+  oss.str(empty);
+  oss.clear();
+  np.put(oss.rdbuf(), oss, L'*', d1);
+  result = oss.str();
+  VERIFY( result == L"-2e+20" );
+
+  oss.str(empty);
+  oss.clear();
+  oss.setf(ios::uppercase);
+  np.put(oss.rdbuf(), oss, L'*', d0);
+  result = oss.str();
+  VERIFY( result == L"2E+20" );
+
+  oss.str(empty);
+  oss.clear();
+  oss.setf(ios::showpos);
+  np.put(oss.rdbuf(), oss, L'*', d0);
+  result = oss.str();
+  VERIFY( result == L"+2E+20" );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
+
+