diff --git a/Source/NSDeallocateObject.m b/Source/NSDeallocateObject.m
index 7630096d6..00ac7f054 100644
--- a/Source/NSDeallocateObject.m
+++ b/Source/NSDeallocateObject.m
@@ -26,6 +26,9 @@
 void NSDeallocateObject(NSObject *anObject)
 {
   if ((anObject!=nil) && CLS_ISCLASS(((id)anObject)->class_pointer))
-    NSZoneFree ([anObject zone], anObject);
+    {
+      ((id)anObject)->class_pointer = (void*) 0xdeadface;
+      NSZoneFree ([anObject zone], anObject);
+    }
   return;
 }