diff --git a/reactos/include/psdk/winbase.h b/reactos/include/psdk/winbase.h
index 0baf57e4e1c..87711fba76f 100644
--- a/reactos/include/psdk/winbase.h
+++ b/reactos/include/psdk/winbase.h
@@ -2146,6 +2146,7 @@ BOOL WINAPI TlsSetValue(DWORD,PVOID);
 BOOL WINAPI TransactNamedPipe(HANDLE,PVOID,DWORD,PVOID,DWORD,PDWORD,LPOVERLAPPED);
 BOOL WINAPI TransmitCommChar(HANDLE,char);
 BOOL WINAPI TryEnterCriticalSection(LPCRITICAL_SECTION);
+BOOL WINAPI TzSpecificLocalTimeToSystemTime(LPTIME_ZONE_INFORMATION,LPSYSTEMTIME,LPSYSTEMTIME);
 LONG WINAPI UnhandledExceptionFilter(LPEXCEPTION_POINTERS);
 BOOL WINAPI UnlockFile(HANDLE,DWORD,DWORD,DWORD,DWORD);
 BOOL WINAPI UnlockFileEx(HANDLE,DWORD,DWORD,DWORD,LPOVERLAPPED);