diff --git a/alib2data/src/string/StringBase.h b/alib2data/src/string/StringBase.h
index fcb64dec1cb58e0457206eeba75cb463d85f98ad..72979c3508de9a0b5ef3539c51e3e36388543ac8 100644
--- a/alib2data/src/string/StringBase.h
+++ b/alib2data/src/string/StringBase.h
@@ -42,7 +42,7 @@ protected:
 	 * @param string parent string to attach as parent
 	 * @return true if symbols used in string are in the regexp's alphabet
 	 */
-	virtual bool attachString ( const String * string );
+	bool attachString ( const String * string );
 
 	/**
 	 * Traverses the string tree computing minimal alphabet needed by the string