diff --git a/motor/aiohttp/__init__.py b/motor/aiohttp/__init__.py
index 1e87e146..16220e76 100644
--- a/motor/aiohttp/__init__.py
+++ b/motor/aiohttp/__init__.py
@@ -248,7 +248,8 @@ def _set_standard_headers(self, path, resp, gridout, checksum):
 
         if cache_time > 0:
             resp.headers["Expires"] = (
-                datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(seconds=cache_time)
+                datetime.datetime.now(datetime.timezone.utc)
+                + datetime.timedelta(seconds=cache_time)
             ).strftime("%a, %d %b %Y %H:%M:%S GMT")
 
             resp.headers["Cache-Control"] = "max-age=" + str(cache_time)
diff --git a/motor/web.py b/motor/web.py
index 66dc4c16..aa6fc2d5 100644
--- a/motor/web.py
+++ b/motor/web.py
@@ -125,7 +125,9 @@ async def get(self, path, include_body=True):
 
         if cache_time > 0:
             self.set_header(
-                "Expires", datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(seconds=cache_time)
+                "Expires",
+                datetime.datetime.now(datetime.timezone.utc)
+                + datetime.timedelta(seconds=cache_time),
             )
             self.set_header("Cache-Control", "max-age=" + str(cache_time))
         else: