diff --git a/library/Icinga/Web/Navigation/Navigation.php b/library/Icinga/Web/Navigation/Navigation.php
index 85460aff3..813e103de 100644
--- a/library/Icinga/Web/Navigation/Navigation.php
+++ b/library/Icinga/Web/Navigation/Navigation.php
@@ -122,6 +122,7 @@ class Navigation implements ArrayAccess, Countable, IteratorAggregate
         }
 
         $item = null;
+        $classPath = null;
         foreach (Icinga::app()->getModuleManager()->getLoadedModules() as $module) {
             $classPath = 'Icinga\\Module\\'
                 . ucfirst($module->getName())
diff --git a/library/Icinga/Web/Navigation/NavigationItem.php b/library/Icinga/Web/Navigation/NavigationItem.php
index e262f5af0..8aaf7b888 100644
--- a/library/Icinga/Web/Navigation/NavigationItem.php
+++ b/library/Icinga/Web/Navigation/NavigationItem.php
@@ -780,6 +780,7 @@ class NavigationItem implements IteratorAggregate
         }
 
         $renderer = null;
+        $classPath = null;
         foreach (Icinga::app()->getModuleManager()->getLoadedModules() as $module) {
             $classPath = 'Icinga\\Module\\' . ucfirst($module->getName()) . '\\' . static::RENDERER_NS . '\\' . $name;
             if (class_exists($classPath)) {