diff --git a/tests/test_tcp.py b/tests/test_tcp.py
index c767708..4462575 100644
--- a/tests/test_tcp.py
+++ b/tests/test_tcp.py
@@ -714,7 +714,12 @@ class Test_UV_TCP(_TestTCP, tb.UVTestCase):
         with self.assertWarnsRegex(ResourceWarning, rx):
             self.loop.create_task(run())
             self.loop.run_until_complete(srv.wait_closed())
+
+            srv = None
             gc.collect()
+            gc.collect()
+            gc.collect()
+
             self.loop.run_until_complete(asyncio.sleep(0.1, loop=self.loop))
 
         # Since one TCPTransport handle wasn't closed correctly,