diff --git a/client/app.js b/client/app.js
index d312130..395182b 100644
--- a/client/app.js
+++ b/client/app.js
@@ -105,6 +105,7 @@ export class App extends decorate(class {}) {
     this.simulationHandle = undefined;
     this.world = config.doPhysicsSimulation ? new World() : undefined;
     this.room.world = this.world;
+    this.room.world.stepTime = config.simulationFrequency;
     // State synchronization.
     this.state = undefined;
     this.synchronizer = new Synchronizer({
diff --git a/server/game.js b/server/game.js
index e10d2d8..81dae48 100644
--- a/server/game.js
+++ b/server/game.js
@@ -20,6 +20,7 @@ export default class Game {
     this.entityPacketSynchronizer = new EntityPacketSynchronizer();
     // Room.
     this.room = createRoom();
+    this.room.world.stepTime = config.simulationInterval;
     for (const entity of this.room.allEntities()) {
       this.onEntityAddedToRoom(entity);
     }