diff --git a/framework/db/Schema.php b/framework/db/Schema.php
index 026339b54e4..9d40871ee1e 100644
--- a/framework/db/Schema.php
+++ b/framework/db/Schema.php
@@ -458,7 +458,7 @@ public function quoteValue($str)
             return $str;
         }
 
-        if (mb_stripos($this->db->dsn, 'odbc:') === false && ($value = $this->db->getSlavePdo()->quote($str)) !== false) {
+        if (mb_stripos((string)$this->db->dsn, 'odbc:') === false && ($value = $this->db->getSlavePdo()->quote($str)) !== false) {
             return $value;
         }