diff --git a/pupy/packages/windows/all/pupwinutils/security.py b/pupy/packages/windows/all/pupwinutils/security.py
index c1c852e8..01129ae1 100644
--- a/pupy/packages/windows/all/pupwinutils/security.py
+++ b/pupy/packages/windows/all/pupwinutils/security.py
@@ -925,7 +925,7 @@ def getSidToken(token_sid):
     if token_sid == SID_SYSTEM:
         sids = ListSids()
         for sid in sids:
-            if not 'winlogon' in sid[1].lower():
+            if 'winlogon' not in sid[1].lower():
                 continue
 
             hToken = gethTokenFromPid(sid[0], exc=False)
diff --git a/pupy/tox.ini b/pupy/tox.ini
index 98ad856a..2f1ef25e 100644
--- a/pupy/tox.ini
+++ b/pupy/tox.ini
@@ -18,6 +18,10 @@ ignore = E722,
        
 
 per-file-ignores =
+	# Because of hack with global import
+	# Should be fixed somehow
+	packages/windows/all/winpty.py: F821
+
 	# X509 standard names are short
 	pupylib/PupyCredentials.py: E741