diff --git a/src/node/hooks/express/tests.js b/src/node/hooks/express/tests.js
index 6b570805..59bd4cdc 100644
--- a/src/node/hooks/express/tests.js
+++ b/src/node/hooks/express/tests.js
@@ -26,7 +26,7 @@ exports.expressCreateServer = (hookName, args, cb) => {
 
     console.debug('Sent browser the following test specs:', files);
     res.setHeader('content-type', 'application/javascript');
-    res.end(`var frontendTestSpecs = ${JSON.stringify(files)};\n`);
+    res.end(`window.frontendTestSpecs = ${JSON.stringify(files)};\n`);
   });
 
   const rootTestFolder = path.join(settings.root, 'src/tests/frontend/');
diff --git a/src/tests/frontend/runner.js b/src/tests/frontend/runner.js
index cdc218ca..d8c54210 100644
--- a/src/tests/frontend/runner.js
+++ b/src/tests/frontend/runner.js
@@ -1,7 +1,5 @@
 'use strict';
 
-/* global frontendTestSpecs */
-
 $(() => {
   const stringifyException = (exception) => {
     let err = exception.stack || exception.toString();
@@ -144,7 +142,7 @@ $(() => {
   require.setGlobalKeyPath('require');
 
   const $body = $('body');
-  for (const spec of frontendTestSpecs.map((spec) => encodeURI(spec))) {
+  for (const spec of window.frontendTestSpecs.map((spec) => encodeURI(spec))) {
     $body.append($('<script>').attr('src', spec.startsWith('/') ? spec : `specs/${spec}`));
   }