diff --git a/alib2data/src/alphabet/NextSymbol.h b/alib2data/src/alphabet/NextSymbol.h
index 9d0586fc83ef59fb9f4928791dcd2f509b3e525e..b9170192704e1b7ac974dfecc3a960047ff17bfe 100644
--- a/alib2data/src/alphabet/NextSymbol.h
+++ b/alib2data/src/alphabet/NextSymbol.h
@@ -54,6 +54,8 @@ class NextSymbol : public VisitableSymbolBase::const_visitor_type, public Visita
 	void Visit(void*, UniqueSymbol& symbol) const;
 
 public:
+	NextSymbol() {}
+
 	/**
 	 * Prints XML representation of String to the output stream.
 	 * @param string String to print