diff -r 406965684327 Lib/test/test_sax.py
--- a/Lib/test/test_sax.py	Fri Nov 21 23:35:12 2014 -0600
+++ b/Lib/test/test_sax.py	Sat Nov 22 23:51:19 2014 +0100
@@ -18,6 +18,7 @@
 import codecs
 import os.path
 import shutil
+import subprocess
 from test import support
 from test.support import findfile, run_unittest
 
@@ -891,6 +892,17 @@
         self.assertEqual(parser.getSystemId(), fname)
         self.assertEqual(parser.getPublicId(), None)
 
+    def test_expat_subprocess(self):
+        result = BytesIO()
+        xmlgen = XMLGenerator(result)
+        parser = create_parser()
+        parser.setContentHandler(xmlgen)
+        proc = subprocess.Popen(["cat", TEST_XMLFILE], stdout=subprocess.PIPE)
+        parser.parse(proc.stdout)
+
+        self.assertNotEquals(parser.getSystemId(), TEST_XMLFILE)
+        self.assertEqual(parser.getPublicId(), None)
+
 
 # ===========================================================================
 #