diff --git a/include/window.h b/include/window.h
index a719f3a0..a4bf3351 100644
--- a/include/window.h
+++ b/include/window.h
@@ -8392,8 +8392,8 @@ MG_EXPORT HWND GUIAPI GetNextMainWindow (HWND hMainWnd);
 #define WIN_SEARCH_METHOD_DFS   0x0100
 
 #define WIN_SEARCH_FILTER_MASK  0x00FF
-#define WIN_SEARCH_FILTER_MAIN  0x0000
-#define WIN_SEARCH_FILTER_VIRT  0x0001
+#define WIN_SEARCH_FILTER_MAIN  0x0001
+#define WIN_SEARCH_FILTER_VIRT  0x0002
 
 /**
  * \fn HWND GUIAPI GetHostedById (HWND hHosting,