diff --git a/test/py.twisted/test_suite.py b/test/py.twisted/test_suite.py
index 048abc5..2c07baa 100755
--- a/test/py.twisted/test_suite.py
+++ b/test/py.twisted/test_suite.py
@@ -172,7 +172,7 @@
         try:
             yield self.client.testException('Xception')
             self.fail("should have gotten exception")
-        except Xception, x:
+        except Xception as x:
             self.assertEquals(x.errorCode, 1001)
             self.assertEquals(x.message, 'Xception')