diff --git a/rtl/win/wininc/redef.inc b/rtl/win/wininc/redef.inc
index ab68d0aa22..2be24b29f4 100644
--- a/rtl/win/wininc/redef.inc
+++ b/rtl/win/wininc/redef.inc
@@ -834,7 +834,7 @@ function SetSysColors(cElements: Integer; const lpaElements; const lpaRgbValues)
 function SetThreadContext(hThread: THandle; const lpContext: TContext): BOOL; external 'kernel32' name 'SetThreadContext';
 //function SetTimeZoneInformation(const lpTimeZoneInformation: TTimeZoneInformation): BOOL; external 'kernel32' name 'SetTimeZoneInformation';
 function SetUserObjectSecurity(hObj: THandle; var pSIRequested: DWORD; pSID: PSecurityDescriptor): BOOL;external 'user32' name 'SetUserObjectSecurity';
-function SetWaitableTimer(hTimer: THandle; const lpDueTime: TLargeInteger; lPeriod: Longint; pfnCompletionRoutine: TFNTimerAPCRoutine; lpArgToCompletionRoutine: Pointer; fResume: BOOL): BOOL;external 'kernel32' name 'SetWaitableTimer';
+function SetWaitableTimer(hTimer: THandle; var lpDueTime: TLargeInteger; lPeriod: Longint; pfnCompletionRoutine: TFNTimerAPCRoutine; lpArgToCompletionRoutine: Pointer; fResume: BOOL): BOOL;external 'kernel32' name 'SetWaitableTimer';
 function SetWinMetaFileBits(p1: UINT; p2: PChar; p3: HDC; const p4: TMetaFilePict): HENHMETAFILE; external 'gdi32' name 'SetWinMetaFileBits';
 //function SetWorldTransform(DC: HDC; const p2: TXForm): BOOL; external 'gdi32' name 'SetWorldTransform';
 function StartDoc(DC: HDC; const p2: TDocInfo): Integer;external 'gdi32' name 'StartDocA';