diff --git a/question/type/ddwtos/questiontype.php b/question/type/ddwtos/questiontype.php
index fb19bfa115d..b0476240d98 100644
--- a/question/type/ddwtos/questiontype.php
+++ b/question/type/ddwtos/questiontype.php
@@ -43,10 +43,6 @@ class qtype_ddwtos extends qtype_gapselect_base {
         return 'draggroup';
     }
 
-    public function requires_qtypes() {
-        return array('gapselect');
-    }
-
     protected function choice_options_to_feedback($choice) {
         $output = new stdClass();
         $output->draggroup = $choice['choicegroup'];
diff --git a/question/type/ddwtos/version.php b/question/type/ddwtos/version.php
index 036d05ab489..defbacae7e9 100644
--- a/question/type/ddwtos/version.php
+++ b/question/type/ddwtos/version.php
@@ -27,3 +27,6 @@ defined('MOODLE_INTERNAL') || die();
 
 $plugin->version  = 2011051200;
 $plugin->requires = 2011051212;
+$plugin->dependencies = array(
+    'qtype_gapselect' => 2011020100,
+);
\ No newline at end of file