diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index c84078d32f8..fc557d71f0a 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -181,6 +181,7 @@ class SubprocessMixin:
                                          loop=self.loop)
             stdout_transport = proc._transport.get_pipe_transport(1)
             stdout_transport.pause_reading = mock.Mock()
+            stdout_transport.resume_reading = mock.Mock()
 
             stdout, stderr = yield from proc.communicate()