diff --git a/alib2data/src/ToXMLComposers.h b/alib2data/src/ToXMLComposers.h
index 58a95de631107304f121025166503cb57a7e0cba..d044b1584701c2cd132826db53415cd54ce70c7b 100644
--- a/alib2data/src/ToXMLComposers.h
+++ b/alib2data/src/ToXMLComposers.h
@@ -25,7 +25,7 @@ namespace alib {
  * Contains reason why the exception occured.
  */
 class ToXMLComposers : public ObjectBase::const_visitor_type {
-	void Visit(void*, const alphabet::LabeledSymbol& symbol) const override;
+	void Visit(void*, const alphabet::LabeledSymbol& symbol) const;
 	void Visit(void*, const alphabet::BlankSymbol& symbol) const;
 	void Visit(void*, const alphabet::BottomOfTheStackSymbol& symbol) const;
 	void Visit(void*, const alphabet::EndSymbol& symbol) const;