diff -r b74897b69184 Lib/test/test_io.py
--- a/Lib/test/test_io.py	Wed Nov 02 20:33:07 2016 -0400
+++ b/Lib/test/test_io.py	Fri Nov 04 16:34:20 2016 +0100
@@ -350,7 +350,10 @@
     def large_file_ops(self, f):
         assert f.readable()
         assert f.writable()
-        self.assertEqual(f.seek(self.LARGE), self.LARGE)
+        try:
+            self.assertEqual(f.seek(self.LARGE), self.LARGE)
+        except (OverflowError, ValueError):
+            self.skipTest("no largefile support")
         self.assertEqual(f.tell(), self.LARGE)
         self.assertEqual(f.write(b"xxx"), 3)
         self.assertEqual(f.tell(), self.LARGE + 3)