diff --git a/include/sqlpp11/custom_query.h b/include/sqlpp11/custom_query.h
index c9cc80be..1576ca0d 100644
--- a/include/sqlpp11/custom_query.h
+++ b/include/sqlpp11/custom_query.h
@@ -102,9 +102,9 @@ namespace sqlpp
     }
 
     template <typename Part>
-    auto with_result_type_of(Part part) -> custom_query_t<Database, Part, Parts...>
+    auto with_result_type_of(Part part) -> custom_query_t<Database, hidden_t<Part>, Parts...>
     {
-      return {tuple_cat(std::make_tuple(part), _parts)};
+      return {tuple_cat(std::make_tuple(hidden(part)), _parts)};
     }
 
     std::tuple<Parts...> _parts;
diff --git a/include/sqlpp11/hidden.h b/include/sqlpp11/hidden.h
index ca44bbf8..81ef18c9 100644
--- a/include/sqlpp11/hidden.h
+++ b/include/sqlpp11/hidden.h
@@ -29,10 +29,10 @@
 
 namespace sqlpp
 {
-  template <typename Part>
-  struct hidden_t : public Part
+  template <typename Clause>
+  struct hidden_t : Clause
   {
-    hidden_t(Part part) : Part(part)
+    hidden_t(Clause clause) : Clause(clause)
     {
     }
 
@@ -43,11 +43,11 @@ namespace sqlpp
     ~hidden_t() = default;
   };
 
-  template <typename Context, typename Part>
-  struct serializer_t<Context, hidden_t<Part>>
+  template <typename Context, typename Clause>
+  struct serializer_t<Context, hidden_t<Clause>>
   {
     using _serialize_check = consistent_t;
-    using T = hidden_t<Part>;
+    using T = hidden_t<Clause>;
 
     static Context& _(const T&, Context& context)
     {
@@ -55,8 +55,8 @@ namespace sqlpp
     }
   };
 
-  template <typename Part>
-  auto hidden(Part part) -> hidden_t<Part>
+  template <typename Clause>
+  auto hidden(Clause part) -> hidden_t<Clause>
   {
     return {part};
   }