--- /usr/share/sushi/js/viewers/text.js.orig	2018-07-25 13:02:04.464531556 -0400
+++ /usr/share/sushi/js/viewers/text.js	2018-07-25 13:02:24.417046788 -0400
@@ -22,6 +22,7 @@
  * Authors: Cosimo Cecchi <cosimoc@redhat.com>
  *
  */
+imports.gi.versions.GtkSource = "3.0";
 
 const Gdk = imports.gi.Gdk;
 const GtkClutter = imports.gi.GtkClutter;