diff --git a/frontend/karma.conf.js b/frontend/karma.conf.js
index 5fdb7cbe6..6138f25cc 100644
--- a/frontend/karma.conf.js
+++ b/frontend/karma.conf.js
@@ -170,5 +170,5 @@ module.exports = (config) => {
   });
 
   // Set default timezone.
-  process.env.TZ = 'UTC';
+  process.env.TZ = "UTC";
 };