--- loncom/interface/lonnavmaps.pm	2017/02/18 23:39:16	1.527
+++ loncom/interface/lonnavmaps.pm	2017/02/20 18:29:22	1.528
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.527 2017/02/18 23:39:16 raeburn Exp $
+# $Id: lonnavmaps.pm,v 1.528 2017/02/20 18:29:22 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1833,6 +1833,10 @@ END
             if ($env{'request.course.id'}) {
                 if (($src =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) && ($is_ssl) &&
                     ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+                    my $hostname = $r->hostname();
+                    if ($hostname ne '') {
+                        $src = 'http://'.$hostname.$src;
+                    }
                     $src .= ($srcHasQuestion? '&' : '?') . 'usehttp=1';
                     $srcHasQuestion = 1;
                 }