diff --git a/reactos/include/base.h b/reactos/include/base.h
index 5781663479b..19856f09ca0 100644
--- a/reactos/include/base.h
+++ b/reactos/include/base.h
@@ -394,7 +394,6 @@ typedef WINBOOL CALLBACK (*ENUMWINDOWSPROC) (HWND, LPARAM);
 typedef WINBOOL CALLBACK (*ENUMWINDOWSTATIONPROC) (LPTSTR, LPARAM);
 typedef VOID CALLBACK (*SENDASYNCPROC) (HWND, UINT, DWORD, LRESULT);
 typedef VOID CALLBACK (*TIMERPROC) (HWND, UINT, UINT, DWORD);
-typedef VOID (*PTIMERAPCROUTINE)(PVOID lpArgToCompletionRoutine,DWORD dwTimerLowValue,DWORD dwTimerHighValue);
 typedef FARPROC GRAYSTRINGPROC;
 typedef WINBOOL CALLBACK (*DRAWSTATEPROC) (HDC, LPARAM, WPARAM, int, int);
 typedef WINBOOL CALLBACK (*PROPENUMPROCEX) (HWND, LPCTSTR, HANDLE, DWORD);