--- loncom/interface/londocs.pm	2018/12/27 20:10:31	1.657
+++ loncom/interface/londocs.pm	2018/12/29 23:24:39	1.658
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Documents
 #
-# $Id: londocs.pm,v 1.657 2018/12/27 20:10:31 raeburn Exp $
+# $Id: londocs.pm,v 1.658 2018/12/29 23:24:39 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -7289,7 +7289,10 @@ sub editing_js {
                 } elsif ($backtourl =~ m{^/adm/wrapper/ext/(?!https:)}) {
                     if (($ENV{'SERVER_PORT'} == 443) && ($hostname ne '')) {
                         unless (&Apache::lonnet::uses_sts()) {
-                            $backtourl = 'http://'.$hostname.$backtourl;
+                            if ($hostname ne '') {
+                                $backtourl = 'http://'.$hostname.$backtourl;
+                            }
+                            $backtourl .= (($backtourl =~ /\?/) ? '&':'?').'usehttp=1';
                         }
                     }
                 }