diff --git a/leenkx/Sources/leenkx/trait/physics/bullet/PhysicsWorld.hx b/leenkx/Sources/leenkx/trait/physics/bullet/PhysicsWorld.hx
index bd32508..74dd869 100644
--- a/leenkx/Sources/leenkx/trait/physics/bullet/PhysicsWorld.hx
+++ b/leenkx/Sources/leenkx/trait/physics/bullet/PhysicsWorld.hx
@@ -101,7 +101,7 @@ class PhysicsWorld extends Trait {
 
 
 
-	public function new(timeScale = 1.0, maxSteps = 10, solverIterations = 10, debugDrawMode: DebugDrawMode = NoDebug) {
+	public function new(timeScale = 1.0, maxSteps = 10, solverIterations = 10, fixedStep = 1 / 60, debugDrawMode: DebugDrawMode = NoDebug) {
 		super();
 
 		if (nullvec) {
@@ -120,6 +120,7 @@ class PhysicsWorld extends Trait {
 		this.timeScale = timeScale;
 		this.maxSteps = maxSteps;
 		this.solverIterations = solverIterations;
+		Time.initFixedStep(fixedStep);
 
 		// First scene
 		if (active == null) {
@@ -299,7 +300,7 @@ class PhysicsWorld extends Trait {
 	}
 
 	function fixedUpdate() {
-		var t = Time.delta * timeScale;
+		var t = Time.fixedStep * timeScale * Time.scale;
 		if (t == 0.0) return; // Simulation paused
 
 		#if lnx_debug
@@ -308,9 +309,6 @@ class PhysicsWorld extends Trait {
 
 		if (preUpdates != null) for (f in preUpdates) f();
 
-		//Bullet physics fixed timescale
-		var fixedTime = 1.0 / 60;
-
 		//This condition must be satisfied to not loose time
 		var currMaxSteps = t < (Time.fixedStep * maxSteps) ? maxSteps : 1;