diff --git a/src/ISortableScope.php b/src/ISortableScope.php
index 04bdea8..df64297 100644
--- a/src/ISortableScope.php
+++ b/src/ISortableScope.php
@@ -4,7 +4,7 @@
 /**
  * @author David Matejka
  */
-interface ISortableScope
+interface ISortableScope extends ISortable
 {
 
 	/**