diff --git a/src/tests/00-basic.ts b/src/tests/00-basic.ts
index f22f633..bf445e4 100644
--- a/src/tests/00-basic.ts
+++ b/src/tests/00-basic.ts
@@ -3,10 +3,10 @@ import { Machine, State, On, Do, Goto, Spawn, Unspawn } from '../index';
 const beginTimer = ()=>{};
 
 type S = 'green' | 'yellow' | 'red';
-type E = 'entry' | 'timer-finished';
+type E = ['entry',null] | ['timer-finished',null];
 
 const machine = 
-  Machine(
+  Machine<S,E>(
     State('green',
       On('entry', 
         Do(beginTimer)