diff --git a/engine/Object.h b/engine/Object.h
index 9781642..c9cbcab 100644
--- a/engine/Object.h
+++ b/engine/Object.h
@@ -10,7 +10,7 @@
 #include <string>
 #include <utility>
 
-class ObjectNameTag {
+class ObjectNameTag final {
 private:
     const std::string _name;
 public:
diff --git a/engine/animation/Timeline.h b/engine/animation/Timeline.h
index f09a266..cc990d6 100644
--- a/engine/animation/Timeline.h
+++ b/engine/animation/Timeline.h
@@ -7,7 +7,7 @@
 
 #include "Animation.h"
 
-class AnimationListTag {
+class AnimationListTag final {
 private:
     const std::string _name;
 public:
diff --git a/engine/physics/RigidBody.h b/engine/physics/RigidBody.h
index d2b3f5f..f486d65 100644
--- a/engine/physics/RigidBody.h
+++ b/engine/physics/RigidBody.h
@@ -12,17 +12,17 @@
 #include "Simplex.h"
 #include "../Mesh.h"
 
-struct CollisionPoint {
+struct CollisionPoint final {
     const Vec3D normal;
     const double depth;
 };
 
-struct FaceNormal {
+struct FaceNormal final {
     const Vec3D normal;
     const double distance;
 };
 
-struct NextSimplex {
+struct NextSimplex final {
     const Simplex newSimplex;
     const Vec3D newDirection;
     const bool finishSearching;