diff --git a/app/ecs/ecs.test.js b/app/ecs/ecs.test.js
index 554b6bc..d2bb5a4 100644
--- a/app/ecs/ecs.test.js
+++ b/app/ecs/ecs.test.js
@@ -293,7 +293,7 @@ test('generates diffs for adding and removing components', () => {
 test('generates diffs for empty components', () => {
   const ecs = new Ecs({Components: {Empty}});
   let entity;
-  entity = ecs.create({Empty});
+  entity = ecs.create({Empty: {}});
   expect(ecs.diff)
     .to.deep.equal({[entity]: {Empty: {}}});
   ecs.setClean();