diff --git a/aredis_om/checks.py b/aredis_om/checks.py
index 78aa75c..be2332c 100644
--- a/aredis_om/checks.py
+++ b/aredis_om/checks.py
@@ -7,7 +7,7 @@ from aredis_om.connections import get_redis_connection
 @lru_cache(maxsize=None)
 async def check_for_command(conn, cmd):
     cmd_info = await conn.execute_command("command", "info", cmd)
-    return not None in cmd_info
+    return None not in cmd_info
 
 
 @lru_cache(maxsize=None)