diff --git a/core/generator.h b/core/generator.h
index 4b88a9e2c..842d16c74 100644
--- a/core/generator.h
+++ b/core/generator.h
@@ -468,6 +468,7 @@ class OKULAR_EXPORT Generator : public QObject
         GeneratorPrivate *d_ptr;
 
         friend class Document;
+        friend class DocumentPrivate;
         /// @endcond PRIVATE
 
     private: