diff --git a/socketio/asyncio_namespace.py b/socketio/asyncio_namespace.py
index e376875..12e9c0f 100644
--- a/socketio/asyncio_namespace.py
+++ b/socketio/asyncio_namespace.py
@@ -192,7 +192,7 @@ class AsyncClientNamespace(namespace.ClientNamespace):
                                       namespace=namespace or self.namespace,
                                       callback=callback)
 
-    async def disconnect(self, namespace=None):
+    async def disconnect(self):
         """Disconnect a client.
 
         The only difference with the :func:`socketio.Client.disconnect` method
@@ -201,5 +201,4 @@ class AsyncClientNamespace(namespace.ClientNamespace):
 
         Note: this method is a coroutine.
         """
-        return await self.client.disconnect(
-            namespace=namespace or self.namespace)
+        return await self.client.disconnect()
diff --git a/socketio/namespace.py b/socketio/namespace.py
index 30ab1bf..418615f 100644
--- a/socketio/namespace.py
+++ b/socketio/namespace.py
@@ -181,11 +181,11 @@ class ClientNamespace(BaseNamespace):
         return self.client.send(data, namespace=namespace or self.namespace,
                                 callback=callback)
 
-    def disconnect(self, namespace=None):
+    def disconnect(self):
         """Disconnect from the server.
 
         The only difference with the :func:`socketio.Client.disconnect` method
         is that when the ``namespace`` argument is not given the namespace
         associated with the class is used.
         """
-        return self.client.disconnect(namespace=namespace or self.namespace)
+        return self.client.disconnect()
diff --git a/tests/asyncio/test_asyncio_namespace.py b/tests/asyncio/test_asyncio_namespace.py
index c3a3178..2916453 100644
--- a/tests/asyncio/test_asyncio_namespace.py
+++ b/tests/asyncio/test_asyncio_namespace.py
@@ -257,6 +257,4 @@ class TestAsyncNamespace(unittest.TestCase):
         mock_client.disconnect = AsyncMock()
         ns._set_client(mock_client)
         _run(ns.disconnect())
-        ns.client.disconnect.mock.assert_called_with(namespace='/foo')
-        _run(ns.disconnect(namespace='/bar'))
-        ns.client.disconnect.mock.assert_called_with(namespace='/bar')
+        ns.client.disconnect.mock.assert_called_with()
diff --git a/tests/common/test_namespace.py b/tests/common/test_namespace.py
index b07e820..10eba66 100644
--- a/tests/common/test_namespace.py
+++ b/tests/common/test_namespace.py
@@ -170,6 +170,4 @@ class TestNamespace(unittest.TestCase):
         ns = namespace.ClientNamespace('/foo')
         ns._set_client(mock.MagicMock())
         ns.disconnect()
-        ns.client.disconnect.assert_called_with(namespace='/foo')
-        ns.disconnect(namespace='/bar')
-        ns.client.disconnect.assert_called_with(namespace='/bar')
+        ns.client.disconnect.assert_called_with()