diff --git a/include/openspace/documentation/documentationengine.h b/include/openspace/documentation/documentationengine.h
index 7f8851686b..de68fb3f99 100644
--- a/include/openspace/documentation/documentationengine.h
+++ b/include/openspace/documentation/documentationengine.h
@@ -87,7 +87,7 @@ public:
      * Returns a static reference to the main singleton DocumentationEngine
      * \return A static reference to the main singleton DocumentationEngine
      */
-    static DocumentationEngine& ref();
+    static openspace::DocumentationEngine& ref();
 
 private:
     /// The list of all Documentation%s that are stored by the DocumentationEngine
diff --git a/include/openspace/engine/configurationmanager.h b/include/openspace/engine/configurationmanager.h
index f242c6440f..06b46babef 100644
--- a/include/openspace/engine/configurationmanager.h
+++ b/include/openspace/engine/configurationmanager.h
@@ -134,7 +134,7 @@ public:
      */
     void loadFromFile(const std::string& filename);
 
-    static Documentation Documentation();
+    static openspace::Documentation Documentation();
 
 private:
     /**