diff --git a/lib/classes/output/icon_system_fontawesome.php b/lib/classes/output/icon_system_fontawesome.php
index d5ef0ab2a12..b047d63c47f 100644
--- a/lib/classes/output/icon_system_fontawesome.php
+++ b/lib/classes/output/icon_system_fontawesome.php
@@ -243,6 +243,7 @@ class icon_system_fontawesome extends icon_system_font {
             'core:i/marker' => 'fa-circle-o',
             'core:i/mean' => 'fa-calculator',
             'core:i/menu' => 'fa-ellipsis-v',
+            'core:i/menubars' => 'fa-bars',
             'core:i/mnethost' => 'fa-external-link',
             'core:i/moodle_host' => 'fa-graduation-cap',
             'core:i/move_2d' => 'fa-arrows',
diff --git a/theme/boost/templates/header.mustache b/theme/boost/templates/header.mustache
index 22526dc5b54..65a2b79e8df 100644
--- a/theme/boost/templates/header.mustache
+++ b/theme/boost/templates/header.mustache
@@ -22,7 +22,7 @@
     <div class="container-fluid navbar-nav">
 
         <div data-region="drawer-toggle">
-            <button aria-expanded="{{#navdraweropen}}true{{/navdraweropen}}{{^navdraweropen}}false{{/navdraweropen}}" aria-controls="nav-drawer" type="button" class="btn pull-xs-left m-r-1 btn-secondary" data-action="toggle-drawer" data-side="left" data-preference="drawer-open-nav"><span aria-hidden="true">&#9776;</span><span class="sr-only">{{#str}}sidepanel, core{{/str}}</span></button>
+            <button aria-expanded="{{#navdraweropen}}true{{/navdraweropen}}{{^navdraweropen}}false{{/navdraweropen}}" aria-controls="nav-drawer" type="button" class="btn pull-xs-left m-r-1 btn-secondary" data-action="toggle-drawer" data-side="left" data-preference="drawer-open-nav">{{#pix}}i/menubars{{/pix}}<span class="sr-only">{{#str}}sidepanel, core{{/str}}</span></button>
         </div>
 
         <a href="{{{ config.wwwroot }}}" class="navbar-brand {{# output.should_display_navbar_logo }}has-logo{{/ output.should_display_navbar_logo }}