diff --git a/test/test_load_balancer.py b/test/test_load_balancer.py
index 728b4e567..d4de8debf 100644
--- a/test/test_load_balancer.py
+++ b/test/test_load_balancer.py
@@ -122,8 +122,10 @@ class TestLB(IntegrationTest):
         session = client.start_session()
         session.start_transaction()
         client.test_session_gc.test.find_one({}, session=session)
-        # Cleanup the transaction left open on the server.
-        self.addCleanup(self.client.admin.command, "killSessions", [session.session_id])
+        # Cleanup the transaction left open on the server unless we're
+        # testing serverless which does not support killSessions.
+        if not client_context.serverless:
+            self.addCleanup(self.client.admin.command, "killSessions", [session.session_id])
         if client_context.load_balancer:
             self.assertEqual(pool.active_sockets, 1)  # Pinned.