diff --git a/windows/win.c b/windows/win.c
index 8225791..19dc0e6 100644
--- a/windows/win.c
+++ b/windows/win.c
@@ -38,7 +38,6 @@
 #include "hook.h"
 #include "message.h"
 #include "queue.h"
-#include "task.h"
 #include "winpos.h"
 #include "winerror.h"
 #include "stackframe.h"
@@ -2976,8 +2975,7 @@
     HWND *list;
     int i, iWndsLocks;
 
-    if (!(list = list_window_children( GetDesktopWindow(), 0, GetCurrentThreadId() )))
-        return TRUE ;
+    if (!(list = list_window_children( GetDesktopWindow(), 0, id ))) return TRUE;
 
     /* Now call the callback function for every window */