Index: core/filter_api.php
===================================================================
--- core/filter_api.php	(revision 284)
+++ core/filter_api.php	(working copy)
@@ -851,6 +851,9 @@
 
 				$c_dir = 'DESC' == $t_dir_fields[$i] ? 'DESC' : 'ASC';
 				$p_query_clauses['order'][] = "$c_cf_alias $c_dir";
+			} else {
+				$c_dir = 'DESC' == $t_dir_fields[$i] ? 'DESC' : 'ASC';
+				$p_query_clauses['order'][] = "$c_sort $c_dir";
 			}
 		}
 	}