diff --git a/pipe_io_server/test_pipe_io_server.py b/pipe_io_server/test_pipe_io_server.py
index 62a13df..5ed3612 100644
--- a/pipe_io_server/test_pipe_io_server.py
+++ b/pipe_io_server/test_pipe_io_server.py
@@ -92,7 +92,7 @@ def test_start_stop():
 def test_start_open_stop():
     pipe_io = EchoPipeIOServer(*get_test_init_params())
     pipe_io.start()
-    with IOPipes(pipe_io.in_pipe, pipe_io.out_pipe) as iopipes:
+    with IOPipes(pipe_io.in_pipe, pipe_io.out_pipe):
         raise_if_thread_blocks(target=pipe_io.wait, unblock_function=pipe_io.stop)