diff --git a/pandas/io/tests/test_json/test_ujson.py b/pandas/io/tests/test_json/test_ujson.py
index fbfac34f5073c..86aeecf169b28 100644
--- a/pandas/io/tests/test_json/test_ujson.py
+++ b/pandas/io/tests/test_json/test_ujson.py
@@ -106,7 +106,7 @@ def test_encodeDoubleTinyExponential(self):
         num = -1e-45
         self.assertEqual(num, ujson.decode(ujson.encode(num)))
         num = -1e-145
-        self.assertEqual(num, ujson.decode(ujson.encode(num)))
+        self.assert_(np.allclose(num, ujson.decode(ujson.encode(num))))
 
     def test_encodeDictWithUnicodeKeys(self):
         input = { u"key1": u"value1", u"key1": u"value1", u"key1": u"value1", u"key1": u"value1", u"key1": u"value1", u"key1": u"value1" }