diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index 8ac707d..3ad6d7c 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -89,6 +89,7 @@
 else:
     template = 'tmp' # XXX might choose a better one
 
+_pidcache = {}
 def gettempprefix():
     """Function to calculate a prefix of the filename to use.
 
@@ -96,9 +97,15 @@
     notion, so that concurrent processes don't generate the same prefix.
     """
 
-    global template
     if template is None:
-        return '@' + `os.getpid()` + '.'
+        p = os.getpid()
+        t = _pidcache.get(p, 0)
+        if t:
+            return t
+        if len(_pidcache) > 100:    # stop unbounded growth
+            _pidcache.clear()
+        t = _pidcache[p] = '@' + `p` + '.'
+        return t
     else:
         return template
 
diff --git a/Lib/test/output/test_mmap b/Lib/test/output/test_mmap
index 24e28f8..ce2c823 100644
--- a/Lib/test/output/test_mmap
+++ b/Lib/test/output/test_mmap
@@ -1,4 +1,5 @@
 test_mmap
+<type 'mmap'>
   Position of foo: 1.0 pages
   Length of file: 2.0 pages
   Contents of byte 0: '\000'
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index d07e4c6..7c49cf2 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -18,6 +18,8 @@
     f.close()
 
     # Simple sanity checks
+
+    print type(m)  # SF bug 128713:  segfaulted on Linux
     print '  Position of foo:', string.find(m, 'foo') / float(PAGESIZE), 'pages'
     assert string.find(m, 'foo') == PAGESIZE
 
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index c567e7b..c1cc013 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -841,9 +841,6 @@
 	int fileno;
 	HANDLE fh = 0;
 
-	/* Patch the object type */
-	mmap_object_type.ob_type = &PyType_Type;
-
 	if (!PyArg_ParseTuple(args,
 			  "iO|z",
 			  &fileno,
@@ -956,6 +953,10 @@
 initmmap(void)
 {
 	PyObject *dict, *module;
+
+	/* Patch the object type */
+	mmap_object_type.ob_type = &PyType_Type;
+
 	module = Py_InitModule ("mmap", mmap_functions);
 	dict = PyModule_GetDict (module);
 	mmap_module_error = PyExc_EnvironmentError;