diff --git a/test/py.tornado/test_suite.py b/test/py.tornado/test_suite.py
index c783962..b63ea2d 100755
--- a/test/py.tornado/test_suite.py
+++ b/test/py.tornado/test_suite.py
@@ -72,6 +72,9 @@
     def testDouble(self, dub):
         return dub
 
+    def testBinary(self, thing):
+        return thing
+
     def testStruct(self, thing):
         return thing