diff --git a/packages/core/watcher/test/fswatcher.js b/packages/core/watcher/test/fswatcher.js
index 013e19ba04e..1ac223fe874 100644
--- a/packages/core/watcher/test/fswatcher.js
+++ b/packages/core/watcher/test/fswatcher.js
@@ -25,8 +25,7 @@ describe('Watcher', function() {
     assert(!!watcher.child);
     assert(watcher.ready);
 
-    let time = Date.now();
     await watcher.stop();
-    assert.notEqual(time, Date.now());
+    assert(watcher.child.killed);
   });
 });