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diff --git a/src/google/protobuf/stubs/atomicops_internals_atomicword_compat.h b/src/google/protobuf/stubs/atomicops_internals_atomicword_compat.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2012 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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.
+
+// This file is an internal atomic implementation, use atomicops.h instead.
+
+#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
+#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
+
+// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
+// which in turn means int. On some LP32 platforms, intptr_t is an int, but
+// on others, it's a long. When AtomicWord and Atomic32 are based on different
+// fundamental types, their pointers are incompatible.
+//
+// This file defines function overloads to allow both AtomicWord and Atomic32
+// data to be used with this interface.
+//
+// On LP64 platforms, AtomicWord and Atomic64 are both always long,
+// so this problem doesn't occur.
+
+#if !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
+                                           AtomicWord old_value,
+                                           AtomicWord new_value) {
+  return NoBarrier_CompareAndSwap(
+      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
+}
+
+inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
+                                           AtomicWord new_value) {
+  return NoBarrier_AtomicExchange(
+      reinterpret_cast<volatile Atomic32*>(ptr), new_value);
+}
+
+inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
+                                            AtomicWord increment) {
+  return NoBarrier_AtomicIncrement(
+      reinterpret_cast<volatile Atomic32*>(ptr), increment);
+}
+
+inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
+                                          AtomicWord increment) {
+  return Barrier_AtomicIncrement(
+      reinterpret_cast<volatile Atomic32*>(ptr), increment);
+}
+
+inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
+                                         AtomicWord old_value,
+                                         AtomicWord new_value) {
+  return Acquire_CompareAndSwap(
+      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
+}
+
+inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
+                                         AtomicWord old_value,
+                                         AtomicWord new_value) {
+  return Release_CompareAndSwap(
+      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
+}
+
+inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
+  NoBarrier_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
+}
+
+inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
+  return Acquire_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
+}
+
+inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
+  return Release_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
+}
+
+inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
+  return NoBarrier_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
+}
+
+inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
+  return Acquire_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
+}
+
+inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
+  return Release_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
+}
+
+}   // namespace internal
+}   // namespace protobuf
+}   // namespace google
+
+#endif  // !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
+
+#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_