diff --git a/sal/inc/internal/once.h b/sal/inc/internal/once.h
deleted file mode 100644
index 45f9c37a8113..000000000000
--- a/sal/inc/internal/once.h
+++ /dev/null
@@ -1,82 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
-/*************************************************************************
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * Copyright 2000, 2010 Oracle and/or its affiliates.
- *
- * OpenOffice.org - a multi-platform office productivity suite
- *
- * This file is part of OpenOffice.org.
- *
- * OpenOffice.org is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 3
- * only, as published by the Free Software Foundation.
- *
- * OpenOffice.org 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 Lesser General Public License version 3 for more details
- * (a copy is included in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU Lesser General Public License
- * version 3 along with OpenOffice.org.  If not, see
- * <http://www.openoffice.org/license.html>
- * for a copy of the LGPLv3 License.
- *
- ************************************************************************/
-
-#ifndef INCLUDED_SAL_INTERNAL_ONCE_H
-#define INCLUDED_SAL_INTERNAL_ONCE_H
-
-/** sal_once_type
- *  (platform dependent)
- */
-
-#if defined(SAL_UNX)
-
-#include <pthread.h>
-
-typedef pthread_once_t sal_once_type;
-
-#define SAL_ONCE_INIT PTHREAD_ONCE_INIT
-#define SAL_ONCE(once, init) pthread_once((once), (init))
-
-#elif defined(SAL_W32)
-
-#define WIN32_LEAN_AND_MEAN
-#pragma warning(push,1) /* disable warnings within system headers */
-#include <windows.h>
-#pragma warning(pop)
-
-typedef struct sal_once_st sal_once_type;
-struct sal_once_st
-{
-    LONG volatile m_done;
-    LONG volatile m_lock;
-};
-
-#define SAL_ONCE_INIT { 0, 0 }
-#define SAL_ONCE(once, init) \
-{ \
-    sal_once_type * control = (once); \
-    if (!(control->m_done)) \
-    { \
-        while (InterlockedExchange(&(control->m_lock), 1) == 1) Sleep(0); \
-        if (!(control->m_done)) \
-        { \
-            void (*init_routine)(void) = (init); \
-            (*init_routine)(); \
-            control->m_done = 1; \
-        } \
-        InterlockedExchange(&(control->m_lock), 0); \
-    } \
-}
-
-#else
-#error Unknown platform
-#endif /* SAL_UNX | SAL_W32 */
-
-#endif /* INCLUDED_SAL_INTERNAL_ONCE_H */
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sal/rtl/source/alloc_arena.cxx b/sal/rtl/source/alloc_arena.cxx
index 20ee962d55c5..03c7f475d10a 100644
--- a/sal/rtl/source/alloc_arena.cxx
+++ b/sal/rtl/source/alloc_arena.cxx
@@ -30,7 +30,6 @@
 #include "alloc_arena.hxx"
 
 #include "alloc_impl.hxx"
-#include "internal/once.h"
 #include "internal/rtllifecycle.h"
 #include "sal/macros.h"
 #include "osl/diagnose.h"
diff --git a/sal/rtl/source/alloc_cache.cxx b/sal/rtl/source/alloc_cache.cxx
index a1d8d5490961..0769b8e68a29 100644
--- a/sal/rtl/source/alloc_cache.cxx
+++ b/sal/rtl/source/alloc_cache.cxx
@@ -29,7 +29,6 @@
 #include "alloc_cache.hxx"
 #include "alloc_impl.hxx"
 #include "alloc_arena.hxx"
-#include "internal/once.h"
 #include "internal/rtllifecycle.h"
 #include "sal/macros.h"
 #include "osl/diagnose.h"
diff --git a/sal/rtl/source/alloc_global.cxx b/sal/rtl/source/alloc_global.cxx
index e48fdd1072c7..c0de49659754 100644
--- a/sal/rtl/source/alloc_global.cxx
+++ b/sal/rtl/source/alloc_global.cxx
@@ -51,7 +51,6 @@ static void determine_alloc_mode()
  *
  * ================================================================= */
 
-#include "internal/once.h"
 #include "sal/macros.h"
 
 /* ================================================================= *
diff --git a/sal/rtl/source/locale.cxx b/sal/rtl/source/locale.cxx
index 1d975ad6fd6b..885b139c3945 100644
--- a/sal/rtl/source/locale.cxx
+++ b/sal/rtl/source/locale.cxx
@@ -31,7 +31,6 @@
 #include "osl/diagnose.h"
 #include "rtl/alloc.h"
 
-#include "internal/once.h"
 #include "internal/rtllifecycle.h"
 
 static sal_Int32 RTL_HASHTABLE_SIZE[] =