diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index da90e17eab2..de29afaa119 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -738,6 +738,7 @@ class LockTests(lock_tests.LockTests):
 class PyRLockTests(lock_tests.RLockTests):
     locktype = staticmethod(threading._PyRLock)
 
+@unittest.skipIf(threading._CRLock is None, 'RLock not implemented in C')
 class CRLockTests(lock_tests.RLockTests):
     locktype = staticmethod(threading._CRLock)
 
diff --git a/Misc/ACKS b/Misc/ACKS
index 158b2317034..d49b85f3f93 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -492,6 +492,7 @@ Orjan Johansen
 Fredrik Johansson
 Gregory K. Johnson
 Simon Johnston
+Matt Joiner
 Thomas Jollans
 Nicolas Joly
 Evan Jones