diff --git a/tests.py b/tests.py
index 5434c60..f4edcc2 100644
--- a/tests.py
+++ b/tests.py
@@ -99,6 +99,9 @@ class TornadoLogFunctionTestCase(unittest.TestCase):
 
 class JSONRequestHandlerTestCase(unittest.TestCase):
 
+    def setUp(self):
+        self.maxDiff = 32768
+
     def test_log_function_return_value(self):
         class LoggingHandler(logging.Handler):
             def __init__(self, level):