diff --git a/src/parser.hpp b/src/parser.hpp
index 013a2f4..343a1e5 100644
--- a/src/parser.hpp
+++ b/src/parser.hpp
@@ -29,7 +29,7 @@
     command_ parseCommand(const std::string& line, std::ostream& errorStream);
     void changeNode(const dataPath_& name);
     std::string currentNode() const;
-    std::set<std::string> availableNodes(const boost::optional<dataPath_>& path, const Recursion& option) const;
+    std::set<std::string> availableNodes(const boost::optional<boost::variant<dataPath_, schemaPath_>>& path, const Recursion& option) const;
 
 private:
     const std::shared_ptr<const Schema> m_schema;