diff --git "a/tests/fixtures/\360\237\230\200.txt" "b/tests/fixtures/\350\257\225.txt"
similarity index 100%
rename from "tests/fixtures/\360\237\230\200.txt"
rename to "tests/fixtures/\350\257\225.txt"
diff --git a/tests/object_file_system_test.php b/tests/object_file_system_test.php
index ba2d8f98..ae534151 100644
--- a/tests/object_file_system_test.php
+++ b/tests/object_file_system_test.php
@@ -607,7 +607,7 @@ public function test_can_generate_signed_url_with_unicode_filename() {
         $filehash = $file->get_contenthash();
         try {
             $headers = [
-                    'Content-Disposition' => 'attachment; filename="😀.txt"',
+                    'Content-Disposition' => 'attachment; filename="试.txt"',
                     'Content-Type' => 'text/plain',
             ];
             $signedurl = $this->filesystem->externalclient->generate_presigned_url($filehash, $headers);