diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index cb58b82d2286..8413861623a7 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -800,7 +800,7 @@ uploads_path: "DATADIR/uploads"
 #  # Directory in which Synapse will try to find the HTML files to serve to the
 #  # user when trying to renew an account. Optional, defaults to
 #  # synapse/res/templates.
-#  template_dir: "res/templates" 
+#  template_dir: "res/templates"
 #  # HTML to be displayed to the user after they successfully renewed their
 #  # account. Optional.
 #  account_renewed_html_path: "account_renewed.html"
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 316b3719aaa3..14752298e9e1 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -14,10 +14,10 @@
 # limitations under the License.
 
 import os
-import pkg_resources
-
 from distutils.util import strtobool
 
+import pkg_resources
+
 from synapse.config._base import Config, ConfigError
 from synapse.types import RoomAlias
 from synapse.util.stringutils import random_string_with_symbols
@@ -54,13 +54,10 @@ def __init__(self, config, synapse_config):
             template_dir = pkg_resources.resource_filename("synapse", "res/templates")
 
         if "account_renewed_html_path" in config:
-            file_path = os.path.join(
-                template_dir, config["account_renewed_html_path"],
-            )
+            file_path = os.path.join(template_dir, config["account_renewed_html_path"])
 
             self.account_renewed_html_content = self.read_file(
-                file_path,
-                "account_validity.account_renewed_html_path",
+                file_path, "account_validity.account_renewed_html_path"
             )
         else:
             self.account_renewed_html_content = (
@@ -68,12 +65,10 @@ def __init__(self, config, synapse_config):
             )
 
         if "invalid_token_html_path" in config:
-            file_path = os.path.join(
-                template_dir, config["invalid_token_html_path"],
-            )
+            file_path = os.path.join(template_dir, config["invalid_token_html_path"])
 
             self.invalid_token_html_content = self.read_file(
-                file_path, "account_validity.invalid_token_html_path",
+                file_path, "account_validity.invalid_token_html_path"
             )
         else:
             self.invalid_token_html_content = (
@@ -200,7 +195,7 @@ def default_config(self, generate_secrets=False, **kwargs):
         #  # Directory in which Synapse will try to find the HTML files to serve to the
         #  # user when trying to renew an account. Optional, defaults to
         #  # synapse/res/templates.
-        #  template_dir: "res/templates" 
+        #  template_dir: "res/templates"
         #  # HTML to be displayed to the user after they successfully renewed their
         #  # account. Optional.
         #  account_renewed_html_path: "account_renewed.html"
diff --git a/synapse/rest/client/v2_alpha/account_validity.py b/synapse/rest/client/v2_alpha/account_validity.py
index 9384cd0d53b4..8091b7828591 100644
--- a/synapse/rest/client/v2_alpha/account_validity.py
+++ b/synapse/rest/client/v2_alpha/account_validity.py
@@ -50,7 +50,7 @@ def on_GET(self, request):
         renewal_token = request.args[b"token"][0]
 
         token_valid = yield self.account_activity_handler.renew_account(
-            renewal_token.decode("utf8"),
+            renewal_token.decode("utf8")
         )
 
         if token_valid: