diff --git a/Engine.cc b/Engine.cc
index 4cdaaec..32efd04 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -210,7 +210,7 @@ void Engine::update()
     if (m_autoPhysics)
         doPhysics();
     lua_getfield(m_luaState, LUA_GLOBALSINDEX, "update");
-    if (lua_type(m_luaState, -1) == LUA_TFUNCTION)
+    if (lua_isfunction(m_luaState, -1))
     {
         /* call the update function - pops the function ref from the stack */
         int s = lua_pcall(m_luaState, 0, LUA_MULTRET, 0);
diff --git a/anaglym.cc b/anaglym.cc
index c03db9a..be741ad 100644
--- a/anaglym.cc
+++ b/anaglym.cc
@@ -79,8 +79,6 @@ static int engine_thread(void * param)
                     {
                         case EVENT_UPDATE:
                             g_engine->update();
-                            GLUquadric * quad = gluNewQuadric();
-                            gluSphere(quad, 4.0, 16, 8);
                             lastUpdateCompleted = true;
                             break;
                     }
@@ -184,7 +182,6 @@ static void mainloop()
             case SDL_USEREVENT:
                 if (event.user.code == 0)
                 {
-                    if (lastUpdateCompleted)
                         SDL_GL_SwapBuffers();
                     update();
                 }