diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 410849fc286..837bdb50a45 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -874,6 +874,7 @@ class ProcessTestCase(BaseTestCase):
                                  stdout=subprocess.PIPE,
                                  bufsize=0)
             f = p.stdout
+            self.addCleanup(f.close)
             try:
                 self.assertEqual(f.read(4), b"appl")
                 self.assertIn(f, select.select([f], [], [], 0.0)[0])
diff --git a/Misc/ACKS b/Misc/ACKS
index 99554da92d6..17091ebabf1 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -325,6 +325,7 @@ Jason Harper
 Larry Hastings
 Shane Hathaway
 Rycharde Hawkes
+Ben Hayden
 Jochen Hayek
 Christian Heimes
 Thomas Heller
diff --git a/Misc/NEWS b/Misc/NEWS
index 6825931972b..8e69a841cb1 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -48,6 +48,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #11659: Fix ResourceWarning in test_subprocess introduced by #11459.
+  Patch by Ben Hayden.
+
 - Issue #5537: Fix time2isoz() and time2netscape() functions of
   httplib.cookiejar for expiration year greater than 2038 on 32-bit systems.