diff --git a/django/core/management/commands/runserver.py b/django/core/management/commands/runserver.py
index c4cd8740512..e2d447147b0 100644
--- a/django/core/management/commands/runserver.py
+++ b/django/core/management/commands/runserver.py
@@ -16,13 +16,13 @@ from django.db.migrations.executor import MigrationExecutor
 from django.utils import autoreload, six
 from django.utils.encoding import force_text, get_system_encoding
 
+
 naiveip_re = re.compile(r"""^(?:
 (?P<addr>
     (?P<ipv4>\d{1,3}(?:\.\d{1,3}){3}) |         # IPv4 address
     (?P<ipv6>\[[a-fA-F0-9:]+\]) |               # IPv6 address
     (?P<fqdn>[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*) # FQDN
 ):)?(?P<port>\d+)$""", re.X)
-DEFAULT_PORT = "8000"
 
 
 class Command(BaseCommand):
@@ -32,6 +32,8 @@ class Command(BaseCommand):
     requires_system_checks = False
     leave_locale_alone = True
 
+    default_port = '8000'
+
     def add_arguments(self, parser):
         parser.add_argument('addrport', nargs='?',
             help='Optional port number, or ipaddr:port')
@@ -68,7 +70,7 @@ class Command(BaseCommand):
         self._raw_ipv6 = False
         if not options.get('addrport'):
             self.addr = ''
-            self.port = DEFAULT_PORT
+            self.port = self.default_port
         else:
             m = re.match(naiveip_re, options['addrport'])
             if m is None: