diff --git a/include/chaiscript/dispatchkit/dynamic_object.hpp b/include/chaiscript/dispatchkit/dynamic_object.hpp
index 3a4eaa8..112e836 100644
--- a/include/chaiscript/dispatchkit/dynamic_object.hpp
+++ b/include/chaiscript/dispatchkit/dynamic_object.hpp
@@ -60,7 +60,7 @@ namespace chaiscript
           const std::string &t_type_name,
           const Proxy_Function &t_func,
           const boost::optional<Type_Info> &t_ti = boost::optional<Type_Info>())
-        : Proxy_Function_Base(t_func->get_param_types()),
+        : Proxy_Function_Base(build_param_types(t_func->get_param_types(), t_ti)),
           m_type_name(t_type_name), m_func(t_func), m_ti(t_ti)
       {
         assert( (t_func->get_arity() > 0 || t_func->get_arity() < 0)
@@ -125,6 +125,22 @@ namespace chaiscript
       }
 
     private:
+      static std::vector<Type_Info> build_param_types(
+          const std::vector<Type_Info> &t_inner_types, boost::optional<Type_Info> t_objectti)
+      {
+        if (t_objectti)
+        {
+          std::vector<Type_Info> types(t_inner_types);
+
+          assert(types.size() > 1);
+          assert(types[1].bare_equal(user_type<Boxed_Value>()));
+          types[1] = *t_objectti;
+          return types;
+        } else {
+          return t_inner_types;
+        }
+      }
+
       static bool dynamic_object_typename_match(const Boxed_Value &bv, const std::string &name,
         const boost::optional<Type_Info> &ti)
       {
diff --git a/unittests/function_introspection.chai b/unittests/function_introspection.chai
index fa83955..7f8e730 100644
--- a/unittests/function_introspection.chai
+++ b/unittests/function_introspection.chai
@@ -5,6 +5,10 @@ def test_function(a)
   return a;
 }
 
+
+
+
+// test_function tests
 assert_equal(test_function.get_arity(), 1);
 assert_equal(test_function.get_annotation(), "#Test Function Description\n");
 assert_equal(test_function.get_contained_functions().size(), 0);
@@ -16,6 +20,24 @@ assert_not_equal(test_function, `+`);
 
 assert_equal(test_function.call([1]), 1);
 
+// dynamic object function tests
+
+def int::test_fun()
+{
+  return this;
+}
+
+assert_equal(test_fun.get_arity(), 1);
+assert_equal(test_fun.get_contained_functions.size(), 1);
+assert_equal(test_fun.get_param_types().size(), 2);
+assert_equal(test_fun, test_fun);
+var test_fun_types = test_fun.get_param_types();
+assert_equal(true, test_fun_types[0].bare_equal(Object_type));
+assert_equal(true, test_fun_types[1].bare_equal(int_type));
+
+
+// built-ins tests
+
 assert_equal(2, `==`.get_arity());
 
 // < should be the merging of two functions bool <(PODObject, PODObject) and bool <(string, string)