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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/26777.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/26777.cc
new file mode 100644
index 00000000..d98234ba
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/26777.cc
@@ -0,0 +1,90 @@
+// { dg-require-fork "" }
+// { dg-require-mkfifo "" }
+
+// 2006-03-22  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2006, 2007, 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/>.
+
+// No asserts, avoid leaking the semaphores if a VERIFY fails.
+#undef _GLIBCXX_ASSERT
+
+#include <testsuite_hooks.h>
+#include <fstream>
+#include <sstream>
+#include <cstdlib>
+#include <unistd.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+// libstdc++/26777
+bool test01()
+{
+  using namespace std;
+  using namespace __gnu_test;
+
+  bool test __attribute__((unused)) = true;
+
+  const char* name = "tmp_fifo6";
+
+  signal(SIGPIPE, SIG_IGN);
+
+  unlink(name);  
+  mkfifo(name, S_IRWXU);
+  semaphore s1, s2;
+
+  int child = fork();
+  VERIFY( child != -1 );
+
+  if (child == 0)
+    {
+      filebuf fbout;
+      fbout.open(name, ios_base::in | ios_base::out);
+      VERIFY( fbout.is_open() );
+      fbout.sputn("Whatever", 8);
+      fbout.pubsync();
+      s1.signal();
+      s2.wait();
+      fbout.close();
+      s1.signal();
+      exit(0);
+    }
+
+  filebuf fbin;
+  fbin.open(name, ios::in);
+  s1.wait();
+
+  fbin.sgetc();
+  fbin.pubseekoff(0, ios::cur, ios::in);
+  s2.signal();
+  s1.wait();
+
+  ostringstream oss;
+  oss << &fbin;
+  fbin.close();
+
+  VERIFY( oss.str() == "Whatever" );
+
+  return test;
+}
+
+int main()
+{
+  return !test01();
+}