diff -urN gtk+-3.20.6-orig/gtk/gtkcssselector.c gtk+-3.20.6/gtk/gtkcssselector.c
--- gtk+-3.20.6-orig/gtk/gtkcssselector.c	2016-03-26 11:46:38 +0900
+++ gtk+-3.20.6/gtk/gtkcssselector.c	2016-07-03 05:29:20 +0900
@@ -802,7 +802,6 @@
       g_string_append (string, ":only-child");
       break;
     case POSITION_SORTED:
-      g_string_append (string, ":sorted");
       break;
     default:
       g_assert_not_reached ();