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diff --git a/libstdc++-v3/testsuite/30_threads/call_once/39909.cc b/libstdc++-v3/testsuite/30_threads/call_once/39909.cc
new file mode 100644
index 00000000..aa125919
--- /dev/null
+++ b/libstdc++-v3/testsuite/30_threads/call_once/39909.cc
@@ -0,0 +1,56 @@
+// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
+// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
+// { dg-require-cstdint "" }
+// { dg-require-gthreads "" }
+
+// Copyright (C) 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/>.
+
+
+#include <mutex>
+#include <thread>
+#include <testsuite_hooks.h>
+
+std::once_flag flag;
+int value = 0;
+
+struct Inc { void operator()() const { ++value; } };
+
+struct Func
+{
+   void operator()() const
+   {
+       Inc inc;
+       for (int i = 0; i < 10000;  ++i)
+           std::call_once(flag, inc);
+   }
+};
+
+int main()
+{
+   Func f;
+   std::thread t1(f);
+   std::thread t2(f);
+   std::thread t3(f);
+   t1.join();
+   t2.join();
+   t3.join();
+   VERIFY( value == 1 );
+   return 0;
+}