diff --git a/mouseover.cc b/mouseover.cc
index df2826e1..dc674b0c 100644
--- a/mouseover.cc
+++ b/mouseover.cc
@@ -27,7 +27,7 @@ const UINT WM_MY_SHOW_TRANSLATION = WM_USER + 301;
 static wchar_t className[] = L"GoldenDictMouseover";
 typedef BOOL ( WINAPI  *ChangeWindowMessageFilterFunc )( UINT, DWORD );
 
-#ifndef WINAPI_FAMILY
+#if WINVER < 0x0601
 typedef struct tagCHANGEFILTERSTRUCT {
   DWORD cbSize;
   DWORD ExtStatus;