diff --git a/src/scene.cpp b/src/scene.cpp
index 50a9de3..602d605 100644
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -191,14 +191,14 @@ std::optional<SceneResult> cast_scene(const Ray ray, Scene& scene, const bool us
     if (depth > max_depth)
         return {};
 
-    const std::function<decltype(test_scene)> scene_func = use_bvh ? test_scene_octree : test_scene;
+    const auto scene_func = use_bvh ? test_scene_octree : test_scene;
 
     if (auto hit = scene_func(ray, scene)) {
         const float diffuse = lighting::point_light(hit->position, light_position, hit->normal);
         SceneResult result = {};
 
         // direct lighting calculation
-        // currently only supports only one light (directional)
+        // currently only supports one light (directional)
         if (glm::dot(light_position - hit->position, hit->normal) > 0) {
             const glm::vec3 light_dir = glm::normalize(light_position - hit->position);