diff --git a/src/system-alloc.h b/src/system-alloc.h
index 8233f96..e88948d 100644
--- a/src/system-alloc.h
+++ b/src/system-alloc.h
@@ -1,11 +1,11 @@
 // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
 // Copyright (c) 2005, Google Inc.
 // All rights reserved.
-// 
+//
 // 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
@@ -15,7 +15,7 @@
 //     * 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
@@ -84,7 +84,7 @@
 void TCMalloc_SystemCommit(void* start, size_t length);
 
 // The current system allocator.
-extern PERFTOOLS_DLL_DECL SysAllocator* sys_alloc;
+extern PERFTOOLS_DLL_DECL SysAllocator* tcmalloc_sys_alloc;
 
 // Number of bytes taken from system.
 extern PERFTOOLS_DLL_DECL size_t TCMalloc_SystemTaken;