diff -r 89665cc05592 Modules/_datetimemodule.c
--- a/Modules/_datetimemodule.c Tue Jul 22 21:29:52 2014 +0100
+++ b/Modules/_datetimemodule.c Tue Jul 22 21:32:52 2014 -0700
@@ -897,11 +897,11 @@
         }
     }
     else {
-        Py_DECREF(offset);
         PyErr_Format(PyExc_TypeError,
                      "tzinfo.%s() must return None or "
                      "timedelta, not '%.200s'",
                      name, Py_TYPE(offset)->tp_name);
+        Py_DECREF(offset);
         return NULL;
     }