Index: wp-includes/class-wp-theme.php
===================================================================
--- wp-includes/class-wp-theme.php	(revision 22098)
+++ wp-includes/class-wp-theme.php	(working copy)
@@ -948,7 +948,7 @@
 		if ( $this->parent() )
 			$page_templates += $this->parent()->get_page_templates();
 
-		return $page_templates;
+		return apply_filters( 'page_templates', $page_templates, $this->get_stylesheet(), $this->get_template() );
 	}
 
 	/**