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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/12790-1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/12790-1.cc
new file mode 100644
index 00000000..b889f1bf
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/12790-1.cc
@@ -0,0 +1,78 @@
+// Copyright (C) 2003, 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
+// .
+
+// 27.8.1.4 Overridden virtual functions
+
+#include
+#include
+#include
+
+class Cvt : public std::codecvt
+{
+public:
+ mutable bool unshift_called;
+
+ Cvt()
+ : unshift_called(false)
+ { }
+
+protected:
+ bool
+ do_always_noconv() const throw()
+ { return false; }
+
+ int
+ do_encoding() const throw()
+ { return -1; }
+
+ std::codecvt_base::result
+ do_unshift(std::mbstate_t&, char* to, char*, char*& to_next) const
+ {
+ unshift_called = true;
+ to_next = to;
+ return std::codecvt_base::ok;
+ }
+};
+
+// libstdc++/12790
+// basic_filebuf::seekoff() should call codecvt::unshift()
+void test01()
+{
+ using namespace std;
+
+ bool test __attribute__((unused)) = true;
+ const char* name = "tmp_seekoff_12790";
+
+ Cvt* cvt = new Cvt;
+ locale loc(locale::classic(), cvt);
+
+ wfilebuf fb;
+ fb.pubimbue(loc);
+
+ fb.open(name, ios_base::out);
+ fb.sputc(L'a');
+
+ VERIFY( !cvt->unshift_called );
+ fb.pubseekoff(0, ios_base::cur);
+ VERIFY( cvt->unshift_called );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}