diff --git a/cohort/index.php b/cohort/index.php
index 38ecfe6a474..3c31556f132 100644
--- a/cohort/index.php
+++ b/cohort/index.php
@@ -86,6 +86,7 @@ $search .= html_writer::start_tag('div');
 $search .= html_writer::label(get_string('searchcohort', 'cohort'), 'cohort_search_q'); // No : in form labels!
 $search .= html_writer::empty_tag('input', array('id'=>'cohort_search_q', 'type'=>'text', 'name'=>'search', 'value'=>$searchquery));
 $search .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('search', 'cohort')));
+$search .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'contextid', 'value'=>$contextid));
 $search .= html_writer::end_tag('div');
 $search .= html_writer::end_tag('form');
 echo $search;