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diff --git a/libstdc++-v3/testsuite/27_io/basic_stringbuf/seekoff/char/16956.cc b/libstdc++-v3/testsuite/27_io/basic_stringbuf/seekoff/char/16956.cc
new file mode 100644
index 00000000..724a12d2
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_stringbuf/seekoff/char/16956.cc
@@ -0,0 +1,60 @@
+// 2004-08-12  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2004, 2009 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/>.
+
+// 27.7.1.3 Overridden virtual functions
+
+#include <sstream>
+#include <testsuite_hooks.h>
+
+// libstdc++/16956
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std;
+
+  typedef stringbuf::int_type int_type;
+  typedef stringbuf::traits_type traits_type;
+  typedef stringbuf::pos_type pos_type;
+  typedef stringbuf::off_type off_type;
+
+  stringbuf strb_01("lara's place", ios_base::in);
+  pos_type pt_1 = strb_01.pubseekoff(5, ios_base::cur, ios_base::in);
+  int_type c1 = strb_01.sgetc();
+  VERIFY( c1 != traits_type::eof() );
+  pos_type pt_2 = strb_01.pubseekoff(2, ios_base::cur, ios_base::in);
+  pos_type pt_3 = strb_01.pubseekpos(pt_1, ios_base::in);
+  int_type c2 = strb_01.sbumpc();
+  VERIFY( off_type(pt_3) == off_type(pt_2) - 2 );
+  VERIFY( c2 == c1 );
+
+  stringbuf strb_02("-", ios_base::out);
+  pos_type pt_4 = strb_02.pubseekoff(0, ios_base::cur, ios_base::out);
+  strb_02.sputn("red", 3);
+  pos_type pt_5 = strb_02.pubseekoff(-3, ios_base::cur, ios_base::out);
+  strb_02.pubseekpos(pt_5, ios_base::out);
+  VERIFY( off_type(pt_5) == off_type(pt_4) );
+  strb_02.sputn("blu", 3);
+  VERIFY( strb_02.str() == "blu" );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}