diff --git a/library/Icinga/Web/StyleSheet.php b/library/Icinga/Web/StyleSheet.php
index 9ca6d9af7..6cc91727f 100644
--- a/library/Icinga/Web/StyleSheet.php
+++ b/library/Icinga/Web/StyleSheet.php
@@ -65,6 +65,7 @@ class StyleSheet
         'css/icinga/layout.less',
         'css/icinga/layout-structure.less',
         'css/icinga/menu.less',
+        'css/icinga/mobilemenu.less',
         'css/icinga/tabs.less',
         'css/icinga/forms.less',
         'css/icinga/setup.less',