diff --git a/question/type/ordering/renderer.php b/question/type/ordering/renderer.php
index 0b385ab0141..3689b55ba04 100644
--- a/question/type/ordering/renderer.php
+++ b/question/type/ordering/renderer.php
@@ -100,15 +100,23 @@ class qtype_ordering_renderer extends qtype_with_combined_feedback_renderer {
             $script .= "            containment: '#$ablockid',\n";
             $script .= "            opacity: 0.6,\n";
             $script .= "            update: function(event, ui) {\n";
-            $script .= "                var ItemsOrder = $(this).sortable('toArray').toString();\n";
-            $script .= "                $('#$responseid').attr('value', ItemsOrder);\n";
+            $script .= "                if (typeof($(this).sortable)=='function') {\n";
+            $script .= "                    var ItemsOrder = $(this).sortable('toArray');\n";
+            $script .= "                } else {\n";
+            $script .= "                    // fix for Moodle 3.4, in which 'sortable' method disappears !!\n";
+            $script .= "                    var ItemsOrder = [];\n";
+            $script .= "                    $(this).children('li.sortableitem').each(function(){\n";
+            $script .= "                        ItemsOrder.push($(this).prop('id'));\n";
+            $script .= "                    });\n";
+            $script .= "                }\n";
+            $script .= "                $('#$responseid').val(ItemsOrder.toString());\n";
             $script .= "            }\n";
             $script .= "        });\n";
             $script .= "        $('#$sortableid').disableSelection();\n";
             $script .= "    });\n";
             $script .= "    $(document).ready(function() {\n";
-            $script .= "        var ItemsOrder = $('#$sortableid').sortable('toArray').toString();\n";
-            $script .= "        $('#$responseid').attr('value', ItemsOrder);\n";
+            $script .= "        var ItemsOrder = $('#$sortableid').sortable('toArray');\n";
+            $script .= "        $('#$responseid').val(ItemsOrder).toString();\n";
             $script .= "    });\n";
             $script .= "}\n";
             $script .= "//]]>\n";
diff --git a/question/type/ordering/version.php b/question/type/ordering/version.php
index cc8f31cb5b9..7f359897424 100644
--- a/question/type/ordering/version.php
+++ b/question/type/ordering/version.php
@@ -29,5 +29,5 @@ $plugin->cron      = 0;
 $plugin->component = 'qtype_ordering';
 $plugin->maturity  = MATURITY_STABLE;
 $plugin->requires  = 2010112400; // Moodle 2.0
-$plugin->version   = 2017080164;
-$plugin->release   = '2017-08-01 (64)';
+$plugin->version   = 2017112265;
+$plugin->release   = '2017-11-22 (65)';