diff --git a/blocks/course_overview/renderer.php b/blocks/course_overview/renderer.php
index 8c424281c64..f532b181b77 100644
--- a/blocks/course_overview/renderer.php
+++ b/blocks/course_overview/renderer.php
@@ -104,7 +104,8 @@ class block_course_overview_renderer extends plugin_renderer_base {
                 $html .= html_writer::end_tag('div');
             }
 
-            $attributes = array('title' => s($course->fullname));
+            // No need to pass title through s() here as it will be done automatically by html_writer.
+            $attributes = array('title' => $course->fullname);
             if ($course->id > 0) {
                 $courseurl = new moodle_url('/course/view.php', array('id' => $course->id));
                 $coursefullname = format_string($course->fullname, true, $course->id);
diff --git a/lib/navigationlib.php b/lib/navigationlib.php
index bc9e1b0129e..a6699fffe70 100644
--- a/lib/navigationlib.php
+++ b/lib/navigationlib.php
@@ -2358,6 +2358,7 @@ class global_navigation extends navigation_node {
 
         $issite = ($course->id == $SITE->id);
         $shortname = format_string($course->shortname, true, array('context' => $coursecontext));
+        $fullname = format_string($course->fullname, true, array('context' => $coursecontext));
 
         if ($issite) {
             $parent = $this;
@@ -2396,7 +2397,9 @@ class global_navigation extends navigation_node {
         $coursenode = $parent->add($shortname, $url, self::TYPE_COURSE, $shortname, $course->id);
         $coursenode->nodetype = self::NODETYPE_BRANCH;
         $coursenode->hidden = (!$course->visible);
-        $coursenode->title(format_string($course->fullname, true, array('context' => context_course::instance($course->id))));
+        // We need to decode &'s here as they will have been added by format_string above and attributes will be encoded again
+        // later.
+        $coursenode->title(str_replace('&', '&', $fullname));
         if (!$forcegeneric) {
             $this->addedcourses[$course->id] = $coursenode;
         }