diff --git a/dblayeroo.php b/dblayeroo.php
index 3636678..61d47c8 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -873,7 +873,8 @@ class dblayeroo
             FROM information_schema.REFERENTIAL_CONSTRAINTS AS rCons,
                  information_schema.KEY_COLUMN_USAGE as kColUsage
             WHERE rCons.CONSTRAINT_SCHEMA=:dbname AND rCons.TABLE_NAME=:table
-              AND rCons.CONSTRAINT_NAME=kColUsage.CONSTRAINT_NAME");
+              AND rCons.CONSTRAINT_NAME=kColUsage.CONSTRAINT_NAME
+              AND rCons.CONSTRAINT_SCHEMA=kColUsage.CONSTRAINT_SCHEMA");
       $st->execute (array(':dbname' => $this->databasename (),
                           ':table' => $tableName));
       $foreignTmp = $st->fetchAll (\PDO::FETCH_ASSOC);