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diff --git a/src/google/protobuf/stubs/once.cc b/src/google/protobuf/stubs/once.cc
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//
+// emulates google3/base/once.h
+//
+// This header is intended to be included only by internal .cc files and
+// generated .pb.cc files.  Users should not use this directly.
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include <google/protobuf/stubs/once.h>
+
+namespace google {
+namespace protobuf {
+
+#ifdef _WIN32
+
+struct GoogleOnceInternal {
+  GoogleOnceInternal() {
+    InitializeCriticalSection(&critical_section);
+  }
+  ~GoogleOnceInternal() {
+    DeleteCriticalSection(&critical_section);
+  }
+  CRITICAL_SECTION critical_section;
+};
+
+GoogleOnceType::GoogleOnceType() {
+  // internal_ may be non-NULL if Init() was already called.
+  if (internal_ == NULL) internal_ = new GoogleOnceInternal;
+}
+
+void GoogleOnceType::Init(void (*init_func)()) {
+  // internal_ may be NULL if we're still in dynamic initialization and the
+  // constructor has not been called yet.  As mentioned in once.h, we assume
+  // that the program is still single-threaded at this time, and therefore it
+  // should be safe to initialize internal_ like so.
+  if (internal_ == NULL) internal_ = new GoogleOnceInternal;
+
+  EnterCriticalSection(&internal_->critical_section);
+  if (!initialized_) {
+    init_func();
+    initialized_ = true;
+  }
+  LeaveCriticalSection(&internal_->critical_section);
+}
+
+#endif
+
+}  // namespace protobuf
+}  // namespace google