diff --git a/docs/conf.py b/docs/conf.py
index 28a2f3df2..587ff2843 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -33,7 +33,7 @@ def __getattr__(cls, name):
 
 
 project = 'Tortoise'
-copyright = '2018, Andrey Bondar'
+copyright = '2018, Andrey Bondar'  # pylint: disable=W0622
 author = 'Andrey Bondar'
 
 
diff --git a/tortoise/backends/asyncpg/client.py b/tortoise/backends/asyncpg/client.py
index 9efc20566..44db99916 100644
--- a/tortoise/backends/asyncpg/client.py
+++ b/tortoise/backends/asyncpg/client.py
@@ -128,7 +128,7 @@ async def execute_insert(self, query: str, values: list) -> int:
         async with self.acquire_connection() as connection:
             # TODO: Cache prepared statement
             stmt = await connection.prepare(query)
-            return (await stmt.fetchval(*values))
+            return await stmt.fetchval(*values)
 
     @translate_exceptions
     async def execute_query(self, query: str) -> List[dict]: