diff --git a/js/src/tests/lib/jittests.py b/js/src/tests/lib/jittests.py
index a6f1911da52..5c64d296be7 100755
--- a/js/src/tests/lib/jittests.py
+++ b/js/src/tests/lib/jittests.py
@@ -341,7 +341,7 @@ def run_tests_parallel(tests, shell_args, options):
     result_process_return_queue = queue_manager.Queue()
     result_process = Process(target=process_test_results_parallel,
                              args=(async_test_result_queue, result_process_return_queue,
-                                   notify_queue, len(tests), options, shell_args))
+                                   notify_queue, len(tests), options))
     result_process.start()
 
     # Ensure that a SIGTERM is handled the same way as SIGINT
@@ -420,12 +420,12 @@ def get_parallel_results(async_test_result_queue, notify_queue):
 
         yield async_test_result
 
-def process_test_results_parallel(async_test_result_queue, return_queue, notify_queue, num_tests, options, shell_args):
+def process_test_results_parallel(async_test_result_queue, return_queue, notify_queue, num_tests, options):
     gen = get_parallel_results(async_test_result_queue, notify_queue)
-    ok = process_test_results(gen, num_tests, options, shell_args)
+    ok = process_test_results(gen, num_tests, options)
     return_queue.put(ok)
 
-def print_test_summary(failures, complete, doing, options, shell_args):
+def print_test_summary(failures, complete, doing, options):
     if failures:
         if options.write_failures:
             try:
@@ -447,28 +447,28 @@ def print_test_summary(failures, complete, doing, options, shell_args):
                 traceback.print_exc()
                 sys.stderr.write('---\n')
 
-        def show_test(test):
+        def show_test(res):
             if options.show_failed:
-                print('    ' + subprocess.list2cmdline(test.command(options.js_shell, shell_args)))
+                print('    ' + subprocess.list2cmdline(res.cmd))
             else:
-                print('    ' + ' '.join(test.jitflags + [test.path]))
+                print('    ' + ' '.join(res.test.jitflags + [res.test.path]))
 
         print('FAILURES:')
         for res in failures:
             if not res.timed_out:
-                show_test(res.test)
+                show_test(res)
 
         print('TIMEOUTS:')
         for res in failures:
             if res.timed_out:
-                show_test(res.test)
+                show_test(res)
 
         return False
     else:
         print('PASSED ALL' + ('' if complete else ' (partial run -- interrupted by user %s)' % doing))
         return True
 
-def process_test_results(results, num_tests, options, shell_args):
+def process_test_results(results, num_tests, options):
     pb = NullProgressBar()
     if not options.hide_progress and not options.show_cmd and ProgressBar.conservative_isatty():
         fmt = [
@@ -518,7 +518,7 @@ def process_test_results(results, num_tests, options, shell_args):
         print_tinderbox("TEST-UNEXPECTED-FAIL", None, "Test execution interrupted by user");
 
     pb.finish(True)
-    return print_test_summary(failures, complete, doing, options, shell_args)
+    return print_test_summary(failures, complete, doing, options)
 
 
 def get_serial_results(tests, shell_args, options):
@@ -527,7 +527,7 @@ def get_serial_results(tests, shell_args, options):
 
 def run_tests(tests, shell_args, options):
     gen = get_serial_results(tests, shell_args, options)
-    ok = process_test_results(gen, len(tests), options, shell_args)
+    ok = process_test_results(gen, len(tests), options)
     return ok
 
 def parse_jitflags(options):