diff --git a/reactos/subsystems/win32/win32k/ntuser/class.c b/reactos/subsystems/win32/win32k/ntuser/class.c
index 93634727111..3484b8f76e4 100644
--- a/reactos/subsystems/win32/win32k/ntuser/class.c
+++ b/reactos/subsystems/win32/win32k/ntuser/class.c
@@ -54,12 +54,7 @@ static VOID
 IntDestroyClass(IN OUT PWINDOWCLASS Class)
 {
     /* there shouldn't be any clones anymore */
-    //ASSERT(Class->Windows == 0);
-    if (Class->Windows)
-    {
-        DPRINT1("FIXME: W3Seek's Class Patch is broken!\n");
-        Class->Windows = 0;
-    }
+    ASSERT(Class->Windows == 0);
     ASSERT(Class->Clone == NULL);
 
     if (Class->Base == Class)