diff --git a/include/matador/query/insert_query_builder.hpp b/include/matador/query/insert_query_builder.hpp
index 8244a53..b33bab6 100644
--- a/include/matador/query/insert_query_builder.hpp
+++ b/include/matador/query/insert_query_builder.hpp
@@ -95,19 +95,19 @@ public:
   }
 
   template < class V >
-  static void on_primary_key(const char *id, V &, const utils::primary_key_attribute& /*attr*/ = utils::default_pk_attributes) {}
+  static void on_primary_key(const char * /*id*/, V &, const utils::primary_key_attribute& /*attr*/ = utils::default_pk_attributes) {}
   static void on_revision(const char *id, uint64_t &/*rev*/);
 
   template<typename Type>
-  static void on_attribute(const char *id, Type &, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
+  static void on_attribute(const char * /*id*/, Type &, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
 
   template<class Pointer>
-  void on_belongs_to(const char *id, Pointer &obj, const utils::foreign_attributes &attr) {
+  void on_belongs_to(const char * /*id*/, Pointer &obj, const utils::foreign_attributes &attr) {
     on_foreign_object(obj, attr);
   }
 
   template<class Pointer>
-  void on_has_one(const char *id, Pointer &obj, const utils::foreign_attributes &attr) {
+  void on_has_one(const char * /*id*/, Pointer &obj, const utils::foreign_attributes &attr) {
     on_foreign_object(obj, attr);
   }
   template<class C>