diff --git a/00339-bpo-16575.patch b/00339-bpo-16575.patch
new file mode 100644
index 0000000..fa6e268
--- /dev/null
+++ b/00339-bpo-16575.patch
@@ -0,0 +1,75 @@
+From 9dbf5d3bc2033940cdca35440cf08814544f81e4 Mon Sep 17 00:00:00 2001
+From: Vinay Sajip <vinay_sajip@yahoo.co.uk>
+Date: Sun, 12 Jan 2020 20:55:54 +0000
+Subject: [PATCH] [3.7] bpo-16575: Disabled checks for union types being passed
+ by value. (GH-17960) (GH-17970)
+
+Although the underlying libffi issue remains open, adding these
+checks have caused problems in third-party projects which are in
+widespread use. See the issue for examples.
+
+The corresponding tests have also been skipped.
+(cherry picked from commit c12440c371025bea9c3bfb94945f006c486c2c01)
+---
+ Lib/ctypes/test/test_structures.py |  3 ++-
+ Modules/_ctypes/_ctypes.c          | 19 +++++++++++++++++++
+ 2 files changed, 21 insertions(+), 1 deletion(-)
+
+diff --git a/Lib/ctypes/test/test_structures.py b/Lib/ctypes/test/test_structures.py
+index c129377041f03..2eb057a9f3009 100644
+--- a/Lib/ctypes/test/test_structures.py
++++ b/Lib/ctypes/test/test_structures.py
+@@ -532,6 +532,7 @@ class U(Union):
+             self.assertEqual(f2, [0x4567, 0x0123, 0xcdef, 0x89ab,
+                                   0x3210, 0x7654, 0xba98, 0xfedc])
+ 
++    @unittest.skipIf(True, 'Test disabled for now - see bpo-16575/bpo-16576')
+     def test_union_by_value(self):
+         # See bpo-16575
+ 
+@@ -612,7 +613,7 @@ class Test5(Structure):
+         self.assertEqual(test5.nested.an_int, 0)
+         self.assertEqual(test5.another_int, 0)
+ 
+-    #@unittest.skipIf('s390' in MACHINE, 'Test causes segfault on S390')
++    @unittest.skipIf(True, 'Test disabled for now - see bpo-16575/bpo-16576')
+     def test_bitfield_by_value(self):
+         # See bpo-16576
+ 
+diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
+index c8fed44599543..dd0c61fd8a9a9 100644
+--- a/Modules/_ctypes/_ctypes.c
++++ b/Modules/_ctypes/_ctypes.c
+@@ -2277,6 +2277,23 @@ converters_from_argtypes(PyObject *ob)
+     for (i = 0; i < nArgs; ++i) {
+         PyObject *tp = PyTuple_GET_ITEM(ob, i);
+         PyObject *cnv;
++/*
++ *      The following checks, relating to bpo-16575 and bpo-16576, have been
++ *      disabled. The reason is that, although there is a definite problem with
++ *      how libffi handles unions (https://github.com/libffi/libffi/issues/33),
++ *      there are numerous libraries which pass structures containing unions
++ *      by values - especially on Windows but examples also exist on Linux
++ *      (https://bugs.python.org/msg359834).
++ *
++ *      It may not be possible to get proper support for unions and bitfields
++ *      until support is forthcoming in libffi, but for now, adding the checks
++ *      has caused problems in otherwise-working software, which suggests it
++ *      is better to disable the checks.
++ *
++ *      Although specific examples reported relate specifically to unions and
++ *      not bitfields, the bitfields check is also being disabled as a
++ *      precaution.
++
+         StgDictObject *stgdict = PyType_stgdict(tp);
+ 
+         if (stgdict != NULL) {
+@@ -2304,6 +2321,8 @@ converters_from_argtypes(PyObject *ob)
+                 return NULL;
+             }
+         }
++ */
++
+         cnv = PyObject_GetAttrString(tp, "from_param");
+         if (!cnv)
+             goto argtypes_error_1;
diff --git a/python3.spec b/python3.spec
index ba5d303..89cc36f 100644
--- a/python3.spec
+++ b/python3.spec
@@ -17,7 +17,7 @@ URL: https://www.python.org/
 #global prerel ...
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: Python
 
 
@@ -307,6 +307,15 @@ Patch328: 00328-pyc-timestamp-invalidation-mode.patch
 # In upstream since 3.8: https://bugs.python.org/issue38347
 Patch335: 00335-backport-pathfix-change.patch
 
+# 00339 #
+# Disabled checks for union types being passed by value
+# Although the underlying libffi issue remains open, adding these
+# checks have caused problems in third-party projects which are in
+# widespread use. See the issue for examples.
+# Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1794572
+# Fixed upstream: https://bugs.python.org/issue16575
+Patch339: 00339-bpo-16575.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -646,6 +655,7 @@ rm Lib/ensurepip/_bundled/*.whl
 %patch316 -p1
 %patch328 -p1
 %patch335 -p1
+%patch339 -p1
 
 
 # Remove files that should be generated by the build
@@ -1554,6 +1564,9 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Tue Jan 28 2020 Miro Hrončok <mhroncok@redhat.com> - 3.7.6-2
+- ctypes: Disable checks for union types being passed by value (#1794572)
+
 * Thu Dec 19 2019 Miro Hrončok <mhroncok@redhat.com> - 3.7.6-1
 - Update to 3.7.6