diff --git a/endpoints/oauthlogin.py b/endpoints/oauthlogin.py
index 865991d8c..a33ea5ddf 100644
--- a/endpoints/oauthlogin.py
+++ b/endpoints/oauthlogin.py
@@ -148,7 +148,7 @@ def github_oauth_callback():
 
   # Retrieve the user's information.
   user_data = get_user(github_login, token)
-  if not user_data or not 'login' in user_data:
+  if not user_data or 'login' not in user_data:
     return render_ologin_error('GitHub')
 
   username = user_data['login']
@@ -168,7 +168,8 @@ def github_oauth_callback():
                           headers={'Accept': 'application/vnd.github.moondragon+json'})
 
     organizations = set([org.get('login').lower() for org in get_orgs.json()])
-    if not (organizations & set(github_login.allowed_organizations())):
+    matching_organizations = organizations & set(github_login.allowed_organizations())
+    if not matching_organizations:
       err = """You are not a member of an allowed GitHub organization.
                Please contact your system administrator if you believe this is in error."""
       return render_ologin_error('GitHub', err)
@@ -351,4 +352,3 @@ def dex_oauth_attach():
     return render_ologin_error(dex_login.public_title, err)
 
   return redirect(url_for('web.user_view', path=user_obj.username, tab='external'))
-