diff --git a/core/js/tests/specHelper.js b/core/js/tests/specHelper.js
index 72d42dfc58..d8ac35f827 100644
--- a/core/js/tests/specHelper.js
+++ b/core/js/tests/specHelper.js
@@ -117,6 +117,7 @@ window.Snap.prototype = {
 };
 
 window.isPhantom = /phantom/i.test(navigator.userAgent);
+document.documentElement.lang = navigator.language;
 
 // global setup for all tests
 (function setupTests() {