diff --git a/sources/demo/Simulation.cpp b/sources/demo/Simulation.cpp
index c0cddde8..3e5bf783 100755
--- a/sources/demo/Simulation.cpp
+++ b/sources/demo/Simulation.cpp
@@ -60,7 +60,7 @@ void Simulation::start() {
     // Get the current time
     lastFrameTime = SDL_GetTicks();
 
-    DynamicEngine* pEngine = &engine;
+    PhysicsEngine* pEngine = &engine;
 
     // Initialize the display time
     pEngine->initializeDisplayTime(Time(SDL_GetTicks()/1000.0));
diff --git a/sources/demo/Simulation.h b/sources/demo/Simulation.h
index b5e70afe..788ad1e9 100755
--- a/sources/demo/Simulation.h
+++ b/sources/demo/Simulation.h
@@ -28,10 +28,10 @@
 // Class Simulation
 class Simulation {
     private :
-        rp3d::PhysicsWorld* world;    // Pointer to the collision world that contains bodies of the simulation
+        rp3d::PhysicsWorld* world;      // Pointer to the collision world that contains bodies of the simulation
         Scene scene;                    // Scene object for displaying the simulation
         Context context;                // Context of the simulation
-        rp3d::CollisionEngine engine;   // Collision engine for the physics of the simulation
+        rp3d::PhysicsEngine engine;     // Collision engine for the physics of the simulation
         bool simRunning;                // True if the simulation is running and false otherwise
         bool mouseButtonPressed;        // True if the left mouse button is pressed
         double lastFrameTime;           // Last frame time