diff --git a/include/matador/object/attribute_definition_generator.hpp b/include/matador/object/attribute_definition_generator.hpp
index c256c06..830dd93 100644
--- a/include/matador/object/attribute_definition_generator.hpp
+++ b/include/matador/object/attribute_definition_generator.hpp
@@ -42,7 +42,7 @@ public:
   template<class Pointer>
   void on_has_one(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
   template<class ContainerType>
-  void on_has_many(ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
+  void on_has_many(const char * /*id*/, ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
   template<class ContainerType>
   void on_has_many_to_many(const char *id, ContainerType &c, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {}
   template<class ContainerType>
@@ -93,7 +93,7 @@ public:
     columns_.push_back(fk_column_generator_.generate(id, *x, ref_table, ref_column));
   }
   template<class ContainerType>
-  void on_has_many(ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
+  void on_has_many(const char *id, ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
   template<class ContainerType>
   void on_has_many_to_many(const char *id, ContainerType &c, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {}
   template<class ContainerType>
diff --git a/include/matador/sql/column_generator.hpp b/include/matador/sql/column_generator.hpp
index 447b2f2..835f7e3 100644
--- a/include/matador/sql/column_generator.hpp
+++ b/include/matador/sql/column_generator.hpp
@@ -87,7 +87,7 @@ public:
     }
   }
   template<class ContainerType>
-  void on_has_many(ContainerType &, const char *, const utils::foreign_attributes &attr)
+  void on_has_many(const char * /*id*/, ContainerType &, const char *, const utils::foreign_attributes &attr)
   {
     if (attr.fetch() == utils::fetch_type::LAZY || force_lazy_) {
       return;