diff --git a/certbot-nginx/certbot_nginx/configurator.py b/certbot-nginx/certbot_nginx/configurator.py
index f5b231ba3..89e67dd04 100644
--- a/certbot-nginx/certbot_nginx/configurator.py
+++ b/certbot-nginx/certbot_nginx/configurator.py
@@ -412,7 +412,7 @@ class NginxConfigurator(common.Installer):
         Rank by how well these match target_name.
 
         :param str target_name: The name to match
-        :param str port: port number
+        :param str port: port number as a string
         :returns: list of dicts containing the vhost, the matching name, and
             the numerical rank
         :rtype: list
diff --git a/certbot-nginx/certbot_nginx/http_01.py b/certbot-nginx/certbot_nginx/http_01.py
index 4f565f2ca..3f814f4a7 100644
--- a/certbot-nginx/certbot_nginx/http_01.py
+++ b/certbot-nginx/certbot_nginx/http_01.py
@@ -94,7 +94,7 @@ class NginxHttp01(common.ChallengePerformer):
 
         """
         vhost = self.configurator.choose_redirect_vhost(achall.domain,
-            self.configurator.config.http01_port, create_if_no_match=True)
+            '%i' % self.configurator.config.http01_port, create_if_no_match=True)
         validation = achall.validation(achall.account_key)
         validation_path = self._get_validation_path(achall)
 
diff --git a/certbot-nginx/certbot_nginx/tests/util.py b/certbot-nginx/certbot_nginx/tests/util.py
index 7b32d8e82..ad1af2b96 100644
--- a/certbot-nginx/certbot_nginx/tests/util.py
+++ b/certbot-nginx/certbot_nginx/tests/util.py
@@ -64,6 +64,7 @@ def get_nginx_configurator(
                     in_progress_dir=os.path.join(backups, "IN_PROGRESS"),
                     server="https://acme-server.org:443/new",
                     tls_sni_01_port=5001,
+                    http01_port=80
                 ),
                 name="nginx",
                 version=version)