1 files changed, 2 insertions, 0 deletions
diff --git a/test/JsonSpec.js b/test/JsonSpec.js
index 0dac0318..d9b245f9 100644
--- a/test/JsonSpec.js
+++ b/test/JsonSpec.js
@@ -1,3 +1,5 @@
+'use strict';
+
 describe('json', function(){
   it('should serialize primitives', function() {
     expect(toJson(0/0)).toEqual('null');