diff --git a/fluent-bundle/test/temporal_test.js b/fluent-bundle/test/temporal_test.js
index ea135711..6219b617 100644
--- a/fluent-bundle/test/temporal_test.js
+++ b/fluent-bundle/test/temporal_test.js
@@ -47,11 +47,11 @@ suite("Temporal support", function () {
     });
 
     test("direct interpolation", function () {
-      assert.strictEqual(msg("direct"), arg.toLocaleString());
+      assert.strictEqual(msg("direct"), arg.toLocaleString("en-US"));
     });
 
     test("run through DATETIME()", function () {
-      assert.strictEqual(msg("dt"), arg.toLocaleString());
+      assert.strictEqual(msg("dt"), arg.toLocaleString("en-US"));
     });
 
     test("run through DATETIME() with month option", function () {