diff --git a/app/ecs-components/world.js b/app/ecs-components/world.js
index 9a4bf15..1647bc0 100644
--- a/app/ecs-components/world.js
+++ b/app/ecs-components/world.js
@@ -1,3 +1,3 @@
 export default {
-  world: {defaultValue: -1, type: 'uint16'},
+  world: 'uint16',
 }
diff --git a/app/ecs/system.js b/app/ecs/system.js
index a348363..b5431bb 100644
--- a/app/ecs/system.js
+++ b/app/ecs/system.js
@@ -105,7 +105,7 @@ export default class System {
         this.ecs.removeMany(entities);
       }
 
-    };
+    }
     return new WrappedSystem();
   }
 
diff --git a/app/engine/engine.js b/app/engine/engine.js
index 69aaa59..7818643 100644
--- a/app/engine/engine.js
+++ b/app/engine/engine.js
@@ -17,7 +17,7 @@ const players = {
     Momentum: {},
     Position: {x: 50, y: 50},
     VisibleAabb: {},
-    World: {world: 0},
+    World: {world: 1},
     Sprite: {image: '/assets/bunny.png'},
   },
 };
@@ -36,7 +36,7 @@ export default class Engine {
     ecs.addSystem(CalculateAabbs);
     ecs.addSystem(UpdateSpatialHash);
     this.ecses = {
-      0: ecs,
+      1: ecs,
     };
     this.connections = [];
     this.connectedPlayers = new Map();
diff --git a/app/engine/engine.test.js b/app/engine/engine.test.js
index 05b2183..276c98c 100644
--- a/app/engine/engine.test.js
+++ b/app/engine/engine.test.js
@@ -6,7 +6,7 @@ import Engine from './engine.js';
 
 test('visibility-based updates', async () => {
   const engine = new Engine(Server);
-  const ecs = engine.ecses[0];
+  const ecs = engine.ecses[1];
   // Create an entity.
   const entity = ecs.get(ecs.create({
     Momentum: {x: 1, y: 0},