diff --git a/MysqliDb.php b/MysqliDb.php
index 19d3d55b..a90e2805 100644
--- a/MysqliDb.php
+++ b/MysqliDb.php
@@ -1093,7 +1093,7 @@ public function orderBy($orderByField, $orderbyDirection = "DESC", $customFields
     {
         $allowedDirection = Array("ASC", "DESC");
         $orderbyDirection = strtoupper(trim($orderbyDirection));
-        $orderByField = preg_replace("/[^-a-z0-9\.\(\),_`\*\'\"]+/i", '', $orderByField);
+        $orderByField = preg_replace("/[^ -a-z0-9\.\(\),_`\*\'\"]+/i", '', $orderByField);
 
         // Add table prefix to orderByField if needed.
         //FIXME: We are adding prefix only if table is enclosed into `` to distinguish aliases