---
 src/M2Crypto/util.py |    4 ++++
 tests/test_asn1.py   |   11 +++++------
 tests/test_x509.py   |    9 ++++-----
 3 files changed, 13 insertions(+), 11 deletions(-)

--- a/src/M2Crypto/util.py
+++ b/src/M2Crypto/util.py
@@ -13,6 +13,7 @@ from __future__ import absolute_import
 
 import binascii
 import logging
+import struct
 import sys
 
 from M2Crypto import m2, six
@@ -29,6 +30,9 @@ class UtilError(Exception):
 
 m2.util_init(UtilError)
 
+def is_32bit():
+    # type: () -> bool
+    return (struct.calcsize("P") * 8) == 32
 
 def pkcs5_pad(data, blklen=8):
     # type: (str, int) -> str
--- a/tests/test_asn1.py
+++ b/tests/test_asn1.py
@@ -5,10 +5,9 @@
 Copyright (c) 2005 Open Source Applications Foundation. All rights reserved."""
 
 import datetime
-import platform
 import time
 
-from M2Crypto import ASN1, m2
+from M2Crypto import ASN1, m2, util
 from tests import unittest
 
 
@@ -39,7 +38,7 @@ class ASN1TestCase(unittest.TestCase):
     def test_Object(self):
         pass  # XXX Dunno how to test
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_TIME(self):
         asn1 = ASN1.ASN1_TIME()
         self.assertEqual(str(asn1), 'Bad time value')
@@ -66,7 +65,7 @@ class ASN1TestCase(unittest.TestCase):
         t2 = time.strftime(format, time.gmtime(t))
         self.assertEqual(t1, t2)
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_UTCTIME(self):
         asn1 = ASN1.ASN1_UTCTIME()
         self.assertEqual(str(asn1), 'Bad time value')
@@ -93,7 +92,7 @@ class ASN1TestCase(unittest.TestCase):
         t2 = time.strftime(format, time.gmtime(t))
         self.assertEqual(t1, t2)
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_TIME_datetime(self):
         asn1 = ASN1.ASN1_TIME()
         # Test get_datetime and set_datetime
@@ -119,7 +118,7 @@ class ASN1TestCase(unittest.TestCase):
         self.assertEqual(t1, t2)
         self.assertEqual(str(udt), str(asn1.get_datetime()))
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_UTCTIME_datetime(self):
         asn1 = ASN1.ASN1_UTCTIME()
         # Test get_datetime and set_datetime
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -12,11 +12,10 @@ Author: Heikki Toivonen
 import base64
 import logging
 import os
-import platform
 import time
 import warnings
 
-from M2Crypto import ASN1, BIO, EVP, RSA, Rand, X509, m2, six  # noqa
+from M2Crypto import ASN1, BIO, EVP, RSA, Rand, X509, m2, six, util  # noqa
 from tests import unittest
 
 log = logging.getLogger(__name__)
@@ -244,7 +243,7 @@ class X509TestCase(unittest.TestCase):
         req.set_version(0)
         self.assertEqual(req.get_version(), 0)
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_mkcert(self):
         for utc in (True, False):
             req, pk = self.mkreq(1024)
@@ -588,12 +587,12 @@ class X509TestCase(unittest.TestCase):
         self.assertEqual(cert.get_serial_number(),
                          127614157056681299805556476275995414779)
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_date_after_2050_working(self):
         cert = X509.load_cert('tests/bad_date_cert.crt')
         self.assertEqual(str(cert.get_not_after()), 'Feb  9 14:57:46 2116 GMT')
 
-    @unittest.skipIf(platform.system() == 'Windows', 'Skip on Windows.')
+    @unittest.skipIf(util.is_32bit(), 'Skip on 32bit architectures.')
     def test_date_reference_counting(self):
         """x509_get_not_before() and x509_get_not_after() return internal
         pointers into X509. As the returned ASN1_TIME objects do not store any