diff --git a/dblayeroo.php b/dblayeroo.php
index d08e509..e08cec7 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -1914,7 +1914,8 @@ class dblayeroo
     if (! is_object ($object))
       $this->DBException ("Invalid object provided to join (not object)");
     if (! is_subclass_of ($object, __CLASS__)  &&
-        get_class ($object) !== "dblayeroo")
+        get_class ($object) !== "dblayeroo" &&
+        get_class ($object) !== __NAMESPACE__."\dblayeroo")
       $this->DBException (
         "Invalid object provided to join (not dblayeroo object)");
     if ($this->dsn !== $object->dsn)