diff --git a/lib/TemplateSwitcher.php b/lib/TemplateSwitcher.php
index 8b69c211..99dd317b 100644
--- a/lib/TemplateSwitcher.php
+++ b/lib/TemplateSwitcher.php
@@ -25,7 +25,7 @@ class TemplateSwitcher
      * @static
      * @var    string
      */
-    protected static $_templateFallback = "bootstrap";
+    protected static $_templateFallback = 'bootstrap';
 
     /**
      * available templates