diff --git a/src/reporters/json.js b/src/reporters/json.js
index 5bc1a1e..9c1f77d 100644
--- a/src/reporters/json.js
+++ b/src/reporters/json.js
@@ -1,5 +1,5 @@
 export default class JSONReporter {
-  constructor ({ stream }) {
+  constructor ({ stream } = {}) {
     this.stream = stream || process.stdout
   }