diff --git a/server/szurubooru/api/user_token_api.py b/server/szurubooru/api/user_token_api.py
index 7724a6c9..77398239 100644
--- a/server/szurubooru/api/user_token_api.py
+++ b/server/szurubooru/api/user_token_api.py
@@ -19,7 +19,7 @@ def get_user_tokens(
     auth.verify_privilege(ctx.user, 'user_tokens:list:%s' % infix)
     user_token_list = user_tokens.get_user_tokens(user)
     return {
-        "results": [_serialize(ctx, token) for token in user_token_list]
+        'results': [_serialize(ctx, token) for token in user_token_list]
     }
 
 
diff --git a/server/szurubooru/tests/middleware/test_authenticator.py b/server/szurubooru/tests/middleware/test_authenticator.py
index 36e74adf..fc19d659 100644
--- a/server/szurubooru/tests/middleware/test_authenticator.py
+++ b/server/szurubooru/tests/middleware/test_authenticator.py
@@ -18,7 +18,7 @@ def test_process_request_bump_login(context_factory, user_factory):
     db.session.flush()
     ctx = context_factory(
         headers={
-            'Authorization': "Basic dGVzdFVzZXI6dGVzdFRva2Vu"
+            'Authorization': 'Basic dGVzdFVzZXI6dGVzdFRva2Vu'
         },
         params={
             'bump-login': 'true'
@@ -38,7 +38,7 @@ def test_process_request_bump_login_with_token(
     db.session.flush()
     ctx = context_factory(
         headers={
-            'Authorization': "Token dGVzdFVzZXI6dGVzdFRva2Vu"
+            'Authorization': 'Token dGVzdFVzZXI6dGVzdFRva2Vu'
         },
         params={
             'bump-login': 'true'
@@ -58,7 +58,7 @@ def test_process_request_basic_auth_valid(context_factory, user_factory):
     user = user_factory()
     ctx = context_factory(
         headers={
-            'Authorization': "Basic dGVzdFVzZXI6dGVzdFBhc3N3b3Jk"
+            'Authorization': 'Basic dGVzdFVzZXI6dGVzdFBhc3N3b3Jk'
         })
     with patch('szurubooru.func.auth.is_valid_password'), \
             patch('szurubooru.func.users.get_user_by_name'):
@@ -72,7 +72,7 @@ def test_process_request_token_auth_valid(context_factory, user_token_factory):
     user_token = user_token_factory()
     ctx = context_factory(
         headers={
-            'Authorization': "Token dGVzdFVzZXI6dGVzdFRva2Vu"
+            'Authorization': 'Token dGVzdFVzZXI6dGVzdFRva2Vu'
         })
     with patch('szurubooru.func.auth.is_valid_token'), \
             patch('szurubooru.func.users.get_user_by_name'), \
@@ -87,7 +87,7 @@ def test_process_request_token_auth_valid(context_factory, user_token_factory):
 def test_process_request_bad_header(context_factory):
     ctx = context_factory(
         headers={
-            'Authorization': "Secret SuperSecretValue"
+            'Authorization': 'Secret SuperSecretValue'
         })
     with pytest.raises(errors.HttpBadRequest):
         authenticator.process_request(ctx)