diff --git a/course/format/renderer.php b/course/format/renderer.php
index 229b29c6cc6..c296ec94b2d 100644
--- a/course/format/renderer.php
+++ b/course/format/renderer.php
@@ -533,7 +533,7 @@ abstract class format_section_renderer_base extends plugin_renderer_base {
         $o.= html_writer::tag('div', '', array('class' => 'left side'));
         $o.= html_writer::tag('div', '', array('class' => 'right side'));
         $o.= html_writer::start_tag('div', array('class' => 'content'));
-        $o.= $this->output->heading(get_string('orphanedactivities'), 3, 'sectionname');
+        $o.= $this->output->heading(get_string('orphanedactivitiesinsectionno', '', $sectionno), 3, 'sectionname');
         return $o;
     }
 
diff --git a/lang/en/moodle.php b/lang/en/moodle.php
index f8dcbc1c779..684ffbd4fd1 100644
--- a/lang/en/moodle.php
+++ b/lang/en/moodle.php
@@ -1319,7 +1319,7 @@ $string['optional'] = 'optional';
 $string['options'] = 'options';
 $string['order'] = 'Order';
 $string['originalpath'] = 'Original path';
-$string['orphanedactivities'] = 'Orphaned activities';
+$string['orphanedactivitiesinsectionno'] = 'Orphaned activities (section {$a})';
 $string['other'] = 'Other';
 $string['outline'] = 'Outline';
 $string['outlinereport'] = 'Outline report';