diff --git a/lib/classes/JsonApi/RouteMap.php b/lib/classes/JsonApi/RouteMap.php
index a4bfc5cf6ea546aac576415b9ab371d800540941..420aff63bf41af2341e00326f017fa5d98cd98f4 100644
--- a/lib/classes/JsonApi/RouteMap.php
+++ b/lib/classes/JsonApi/RouteMap.php
@@ -119,7 +119,7 @@ class RouteMap
         $this->addAuthenticatedContactsRoutes($group);
         $this->addAuthenticatedCoursesRoutes($group);
 
-        if (PluginManager::getInstance()->getPlugin('CoursewareModule')) {
+        if (\PluginManager::getInstance()->getPlugin('CoursewareModule')) {
             $this->addAuthenticatedCoursewareRoutes($group);
         }