diff --git a/tests/functional/test_mturk.py b/tests/functional/test_mturk.py
index b30461b2f3..bd4e4267f6 100644
--- a/tests/functional/test_mturk.py
+++ b/tests/functional/test_mturk.py
@@ -23,7 +23,7 @@ def setUp(self):
         self.stubber.activate()
 
     def tearDown(self):
-        super().setUp()
+        super().tearDown()
         self.stubber.deactivate()
 
     def test_list_hits_aliased(self):
diff --git a/tests/functional/test_sagemaker.py b/tests/functional/test_sagemaker.py
index 354d8d2c7e..59a5d61434 100644
--- a/tests/functional/test_sagemaker.py
+++ b/tests/functional/test_sagemaker.py
@@ -15,6 +15,7 @@ def _hook(self, **kwargs):
         self.hook_calls.append(kwargs['event_name'])
 
     def tearDown(self):
+        super().tearDown()
         self.stubber.deactivate()
 
     def test_event_with_old_prefix(self):
diff --git a/tests/unit/auth/test_signers.py b/tests/unit/auth/test_signers.py
index bfb25e8cf0..880b6bbaaf 100644
--- a/tests/unit/auth/test_signers.py
+++ b/tests/unit/auth/test_signers.py
@@ -716,6 +716,7 @@ def setUp(self):
 
     def tearDown(self):
         self.time_patch.stop()
+        super().tearDown()
 
     def test_presign_with_query_string(self):
         self.request.url = (
@@ -808,6 +809,7 @@ def setUp(self):
 
     def tearDown(self):
         self.datetime_patcher.stop()
+        super().tearDown()
 
     def test_presign_no_params(self):
         request = AWSRequest()
@@ -1044,6 +1046,7 @@ def setUp(self):
 
     def tearDown(self):
         self.time_patch.stop()
+        super().tearDown()
 
     def test_presign_post(self):
         self.auth.add_auth(self.request)
@@ -1110,6 +1113,7 @@ def setUp(self):
 
     def tearDown(self):
         self.datetime_patcher.stop()
+        super().tearDown()
 
     def test_presign_post(self):
         self.auth.add_auth(self.request)
diff --git a/tests/unit/test_configloader.py b/tests/unit/test_configloader.py
index e8ef97d133..9f68815f5e 100644
--- a/tests/unit/test_configloader.py
+++ b/tests/unit/test_configloader.py
@@ -23,7 +23,7 @@
     multi_file_load_config,
     raw_config_parse,
 )
-from tests import BaseEnvVar, mock, unittest
+from tests import mock, unittest
 
 
 def path(filename):
@@ -33,7 +33,7 @@ def path(filename):
     return os.path.join(directory, filename)
 
 
-class TestConfigLoader(BaseEnvVar):
+class TestConfigLoader(unittest.TestCase):
     def setUp(self):
         self.tempdir = tempfile.mkdtemp()