diff --git a/src/Factory.php b/src/Factory.php
index 0222478..6b7766d 100644
--- a/src/Factory.php
+++ b/src/Factory.php
@@ -16,7 +16,7 @@
 abstract class Factory {
 
     protected static $modelName = null;
-    private static $relationshipPrefixes = ['with', 'for'];
+    protected static $relationshipPrefixes = ['with', 'for'];
 
     protected
         $count = 1,