diff --git a/src/socketio/async_simple_client.py b/src/socketio/async_simple_client.py
index c6cd4fc1..adac6ead 100644
--- a/src/socketio/async_simple_client.py
+++ b/src/socketio/async_simple_client.py
@@ -12,6 +12,8 @@ class AsyncSimpleClient:
     The positional and keyword arguments given in the constructor are passed
     to the underlying :func:`socketio.AsyncClient` object.
     """
+    client_class = AsyncClient
+
     def __init__(self, *args, **kwargs):
         self.client_args = args
         self.client_kwargs = kwargs
@@ -60,7 +62,8 @@ async def connect(self, url, headers={}, auth=None, transports=None,
         self.namespace = namespace
         self.input_buffer = []
         self.input_event.clear()
-        self.client = AsyncClient(*self.client_args, **self.client_kwargs)
+        self.client = self.client_class(
+            *self.client_args, **self.client_kwargs)
 
         @self.client.event(namespace=self.namespace)
         def connect():  # pragma: no cover
diff --git a/src/socketio/simple_client.py b/src/socketio/simple_client.py
index 67791477..3f046b4b 100644
--- a/src/socketio/simple_client.py
+++ b/src/socketio/simple_client.py
@@ -12,6 +12,8 @@ class SimpleClient:
     The positional and keyword arguments given in the constructor are passed
     to the underlying :func:`socketio.Client` object.
     """
+    client_class = Client
+
     def __init__(self, *args, **kwargs):
         self.client_args = args
         self.client_kwargs = kwargs
@@ -58,7 +60,8 @@ def connect(self, url, headers={}, auth=None, transports=None,
         self.namespace = namespace
         self.input_buffer = []
         self.input_event.clear()
-        self.client = Client(*self.client_args, **self.client_kwargs)
+        self.client = self.client_class(
+            *self.client_args, **self.client_kwargs)
 
         @self.client.event(namespace=self.namespace)
         def connect():  # pragma: no cover
diff --git a/tests/async/test_simple_client.py b/tests/async/test_simple_client.py
index 08926922..bfe2a90f 100644
--- a/tests/async/test_simple_client.py
+++ b/tests/async/test_simple_client.py
@@ -16,46 +16,51 @@ async def test_constructor(self):
         assert not client.connected
 
     async def test_connect(self):
+        mock_client = mock.MagicMock()
+        original_client_class = AsyncSimpleClient.client_class
+        AsyncSimpleClient.client_class = mock_client
+
         client = AsyncSimpleClient(123, a='b')
-        with mock.patch('socketio.async_simple_client.AsyncClient') \
-                as mock_client:
+        mock_client.return_value.connect = mock.AsyncMock()
+
+        await client.connect('url', headers='h', auth='a', transports='t',
+                             namespace='n', socketio_path='s',
+                             wait_timeout='w')
+        mock_client.assert_called_once_with(123, a='b')
+        assert client.client == mock_client()
+        mock_client().connect.assert_awaited_once_with(
+            'url', headers='h', auth='a', transports='t',
+            namespaces=['n'], socketio_path='s', wait_timeout='w')
+        mock_client().event.call_count == 3
+        mock_client().on.assert_called_once_with('*', namespace='n')
+        assert client.namespace == 'n'
+        assert not client.input_event.is_set()
+
+        AsyncSimpleClient.client_class = original_client_class
+
+    async def test_connect_context_manager(self):
+        mock_client = mock.MagicMock()
+        original_client_class = AsyncSimpleClient.client_class
+        AsyncSimpleClient.client_class = mock_client
+
+        async with AsyncSimpleClient(123, a='b') as client:
             mock_client.return_value.connect = mock.AsyncMock()
 
-            await client.connect('url', headers='h', auth='a', transports='t',
-                                 namespace='n', socketio_path='s',
-                                 wait_timeout='w')
+            await client.connect('url', headers='h', auth='a',
+                                 transports='t', namespace='n',
+                                 socketio_path='s', wait_timeout='w')
             mock_client.assert_called_once_with(123, a='b')
             assert client.client == mock_client()
             mock_client().connect.assert_awaited_once_with(
                 'url', headers='h', auth='a', transports='t',
                 namespaces=['n'], socketio_path='s', wait_timeout='w')
             mock_client().event.call_count == 3
-            mock_client().on.assert_called_once_with('*', namespace='n')
+            mock_client().on.assert_called_once_with(
+                '*', namespace='n')
             assert client.namespace == 'n'
             assert not client.input_event.is_set()
 
-    async def test_connect_context_manager(self):
-        async def _t():
-            async with AsyncSimpleClient(123, a='b') as client:
-                with mock.patch('socketio.async_simple_client.AsyncClient') \
-                        as mock_client:
-                    mock_client.return_value.connect = mock.AsyncMock()
-
-                    await client.connect('url', headers='h', auth='a',
-                                         transports='t', namespace='n',
-                                         socketio_path='s', wait_timeout='w')
-                    mock_client.assert_called_once_with(123, a='b')
-                    assert client.client == mock_client()
-                    mock_client().connect.assert_awaited_once_with(
-                        'url', headers='h', auth='a', transports='t',
-                        namespaces=['n'], socketio_path='s', wait_timeout='w')
-                    mock_client().event.call_count == 3
-                    mock_client().on.assert_called_once_with(
-                        '*', namespace='n')
-                    assert client.namespace == 'n'
-                    assert not client.input_event.is_set()
-
-        await _t()
+        AsyncSimpleClient.client_class = original_client_class
 
     async def test_connect_twice(self):
         client = AsyncSimpleClient(123, a='b')
diff --git a/tests/common/test_simple_client.py b/tests/common/test_simple_client.py
index 42790573..b17afbcc 100644
--- a/tests/common/test_simple_client.py
+++ b/tests/common/test_simple_client.py
@@ -14,10 +14,34 @@ def test_constructor(self):
         assert not client.connected
 
     def test_connect(self):
+        mock_client = mock.MagicMock()
+        original_client_class = SimpleClient.client_class
+        SimpleClient.client_class = mock_client
+
         client = SimpleClient(123, a='b')
-        with mock.patch('socketio.simple_client.Client') as mock_client:
+        client.connect('url', headers='h', auth='a', transports='t',
+                       namespace='n', socketio_path='s', wait_timeout='w')
+        mock_client.assert_called_once_with(123, a='b')
+        assert client.client == mock_client()
+        mock_client().connect.assert_called_once_with(
+            'url', headers='h', auth='a', transports='t',
+            namespaces=['n'], socketio_path='s', wait_timeout='w')
+        mock_client().event.call_count == 3
+        mock_client().on.assert_called_once_with('*', namespace='n')
+        assert client.namespace == 'n'
+        assert not client.input_event.is_set()
+
+        SimpleClient.client_class = original_client_class
+
+    def test_connect_context_manager(self):
+        mock_client = mock.MagicMock()
+        original_client_class = SimpleClient.client_class
+        SimpleClient.client_class = mock_client
+
+        with SimpleClient(123, a='b') as client:
             client.connect('url', headers='h', auth='a', transports='t',
-                           namespace='n', socketio_path='s', wait_timeout='w')
+                           namespace='n', socketio_path='s',
+                           wait_timeout='w')
             mock_client.assert_called_once_with(123, a='b')
             assert client.client == mock_client()
             mock_client().connect.assert_called_once_with(
@@ -28,21 +52,7 @@ def test_connect(self):
             assert client.namespace == 'n'
             assert not client.input_event.is_set()
 
-    def test_connect_context_manager(self):
-        with SimpleClient(123, a='b') as client:
-            with mock.patch('socketio.simple_client.Client') as mock_client:
-                client.connect('url', headers='h', auth='a', transports='t',
-                               namespace='n', socketio_path='s',
-                               wait_timeout='w')
-                mock_client.assert_called_once_with(123, a='b')
-                assert client.client == mock_client()
-                mock_client().connect.assert_called_once_with(
-                    'url', headers='h', auth='a', transports='t',
-                    namespaces=['n'], socketio_path='s', wait_timeout='w')
-                mock_client().event.call_count == 3
-                mock_client().on.assert_called_once_with('*', namespace='n')
-                assert client.namespace == 'n'
-                assert not client.input_event.is_set()
+        SimpleClient.client_class = original_client_class
 
     def test_connect_twice(self):
         client = SimpleClient(123, a='b')