diff --git a/src/static_schema.hpp b/src/static_schema.hpp
index 8b160b0..554d83a 100644
--- a/src/static_schema.hpp
+++ b/src/static_schema.hpp
@@ -50,6 +50,7 @@
     bool isModule(const std::string& name) const override;
     bool listHasKey(const schemaPath_& location, const ModuleNodePair& node, const std::string& key) const override;
     bool leafIsKey(const std::string& leafPath) const override;
+    bool isConfig(const std::string& leafPath) const override;
     const std::set<std::string> listKeys(const schemaPath_& location, const ModuleNodePair& node) const override;
     yang::TypeInfo leafType(const schemaPath_& location, const ModuleNodePair& node) const override;
     yang::TypeInfo leafType(const std::string& path) const override;