--- Lib/test/test_regrtest.py
+++ Lib/test/test_regrtest.py
@@ -433,7 +433,15 @@
         self.tests = [self.create_test() for index in range(self.NTEST)]
 
         self.python_args = ['-Wd', '-E', '-bb']
-        self.regrtest_args = ['-uall', '-rwW', '--timeout', '3600', '-j4']
+        self.regrtest_args = ['-uall', '-rwW']
+        if hasattr(faulthandler, 'dump_traceback_later'):
+            self.regrtest_args.extend(('--timeout', '3600'))
+        try:
+            import threading
+        except ImportError:
+            pass
+        else:
+            self.regrtest_args.append('-j4')
         if sys.platform == 'win32':
             self.regrtest_args.append('-n')