diff --git a/argos/checks/checks.py b/argos/checks/checks.py
index 3eeb6e0..a702758 100644
--- a/argos/checks/checks.py
+++ b/argos/checks/checks.py
@@ -1,12 +1,12 @@
-import ssl
-import time
 from datetime import datetime
 
-from OpenSSL import crypto
-
-from argos.checks.base import (BaseCheck, ExpectedIntValue,
-                               ExpectedStringValue, Response, Severity, Status)
-from argos.logging import logger
+from argos.checks.base import (
+    BaseCheck,
+    ExpectedIntValue,
+    ExpectedStringValue,
+    Severity,
+    Status,
+)
 
 
 class HTTPStatus(BaseCheck):
@@ -44,7 +44,7 @@ class SSLCertificateExpiration(BaseCheck):
         if response.is_error:
             raise
 
-        network_stream = ssl_object = response.extensions["network_stream"]
+        network_stream = response.extensions["network_stream"]
         ssl_obj = network_stream.get_extra_info("ssl_object")
         cert = ssl_obj.getpeercert()