diff -r 82ba1f46def5 Lib/test/test_int.py
--- a/Lib/test/test_int.py	Thu Sep 27 20:07:45 2012 +1000
+++ b/Lib/test/test_int.py	Thu Sep 27 18:08:24 2012 +0100
@@ -305,6 +305,18 @@
                     self.fail("Failed to raise TypeError with %s" %
                               ((base, trunc_result_base),))
 
+                # Regression test for bugs.python.org/issue16060.
+                class BadInt(trunc_result_base):
+                    def __int__(self):
+                        return 42.0
+
+                class TruncReturnsBadInt(base):
+                    def __trunc__(self):
+                        return BadInt()
+
+                with self.assertRaises(TypeError):
+                    int(TruncReturnsBadInt())
+
     def test_error_message(self):
         testlist = ('\xbd', '123\xbd', '  123 456  ')
         for s in testlist:
diff -r 82ba1f46def5 Objects/abstract.c
--- a/Objects/abstract.c	Thu Sep 27 20:07:45 2012 +1000
+++ b/Objects/abstract.c	Thu Sep 27 18:08:24 2012 +0100
@@ -1228,11 +1228,10 @@
     nb = Py_TYPE(integral)->tp_as_number;
     if (nb->nb_int) {
         PyObject *as_int = nb->nb_int(integral);
-        Py_DECREF(integral);
-        if (!as_int)
-            return NULL;
-        if (PyLong_Check(as_int))
+        if (!as_int || PyLong_Check(as_int)) {
+            Py_DECREF(integral);
             return as_int;
+        }
         Py_DECREF(as_int);
     }
     PyErr_Format(PyExc_TypeError, error_format, Py_TYPE(integral)->tp_name);