diff --git a/qutebrowser/utils/urlutils.py b/qutebrowser/utils/urlutils.py
index 948d2b5c7..4c189ac3b 100644
--- a/qutebrowser/utils/urlutils.py
+++ b/qutebrowser/utils/urlutils.py
@@ -424,7 +424,7 @@ def same_domain(url1, url2):
     if suffix1 == '':
         return url1.host() == url2.host()
 
-    if not suffix1 == suffix2:
+    if suffix1 != suffix2:
         return False
 
     domain1 = url1.host()[:-len(suffix1)].split('.')[-1]
diff --git a/tests/unit/config/test_configtypes.py b/tests/unit/config/test_configtypes.py
index 43190c3cf..77b37296f 100644
--- a/tests/unit/config/test_configtypes.py
+++ b/tests/unit/config/test_configtypes.py
@@ -1984,10 +1984,10 @@ class TestConfirmQuit:
         assert 'never' in completions
         assert 'multiple-tabs,downloads' in completions
         for val in completions:
-            assert not 'always,' in val
-            assert not ',always' in val
-            assert not 'never,' in val
-            assert not ',never' in val
+            assert 'always,' not in val
+            assert ',always' not in val
+            assert 'never,' not in val
+            assert ',never' not in val
 
 
 class TestFormatString: