diff --git a/rtl/win32/redef.inc b/rtl/win32/redef.inc
new file mode 100644
index 0000000000..f595c59fa6
--- /dev/null
+++ b/rtl/win32/redef.inc
@@ -0,0 +1,24 @@
+{
+    $Id$
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 1998 by the Free Pascal development team
+
+    This file defines type names as they are used by Delphi
+    
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program 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.
+
+ **********************************************************************}
+type
+   TRTLCriticalSection = CRITICAL_SECTION;
+   PRTLCriticalSection = PCRITICAL_SECTION;
+
+  procedure InitializeCriticalSection(var CriticalSection : TRTLCriticalSection);
+  procedure EnterCriticalSection(var CriticalSection : TRTLCriticalSection);
+  procedure LeaveCriticalSection(var CriticalSection : TRTLCriticalSection);
+  procedure DeleteCriticalSection(var CriticalSection : TRTLCriticalSection);
+