diff --git a/Engine.cc b/Engine.cc
index 61eb78c..4fa726a 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -800,7 +800,11 @@ void Engine::Object::render()
             float x_o = (*m_args)[0];
             float y_o = (*m_args)[1];
             float z_o = (*m_args)[2];
+#ifdef dSINGLE
             glNormal3fv(rotated_plane_direction);
+#else
+            glNormal3dv(rotated_plane_direction);
+#endif
             for (int x = 0; x < num_sections; x++)
             {
                 glBegin(GL_QUAD_STRIP);