diff --git a/stdnet/backends/__init__.py b/stdnet/backends/__init__.py
index ad706df..e6b3b70 100755
--- a/stdnet/backends/__init__.py
+++ b/stdnet/backends/__init__.py
@@ -319,7 +319,7 @@ def setup_connection(self, address):
 must return a instance of the backend handler.'''
         raise NotImplementedError()
 
-    def execute_session(self, session, callback):
+    def execute_session(self, session_data):
         '''Execute a :class:`stdnet.odm.Session` in the backend server.'''
         raise NotImplementedError()
 
diff --git a/tests/all/backends/interface.py b/tests/all/backends/interface.py
index 0211568..a393c5b 100644
--- a/tests/all/backends/interface.py
+++ b/tests/all/backends/interface.py
@@ -22,7 +22,7 @@ def testVirtuals(self):
         b = self.get_backend()
         self.assertEqual(str(b), 'dummy://127.0.0.1:9090')
         self.assertFalse(b.clean(None))
-        self.assertRaises(NotImplementedError, b.execute_session, None, None)
+        self.assertRaises(NotImplementedError, b.execute_session, None)
         self.assertRaises(NotImplementedError, b.model_keys, None)
         self.assertRaises(NotImplementedError, b.flush)