Index: src/persistent/cPickleCache.c
===================================================================
--- src/persistent/cPickleCache.c	(revision 80887)
+++ src/persistent/cPickleCache.c	(working copy)
@@ -378,7 +378,7 @@
 cc_invalidate(ccobject *self, PyObject *inv)
 {
   PyObject *key, *v;
-  int i = 0;
+  Py_ssize_t i = 0;
 
   if (PyDict_Check(inv))
     {
@@ -448,7 +448,7 @@
 cc_klass_items(ccobject *self)
 {
     PyObject *l,*k,*v;
-    int p = 0;
+    Py_ssize_t p = 0;
 
     l = PyList_New(0);
     if (l == NULL)
@@ -477,7 +477,7 @@
 cc_debug_info(ccobject *self)
 {
     PyObject *l,*k,*v;
-    int p = 0;
+    Py_ssize_t p = 0;
 
     l = PyList_New(0);
     if (l == NULL)
@@ -707,7 +707,7 @@
 static int
 cc_clear(ccobject *self)
 {
-    int pos = 0;
+    Py_ssize_t pos = 0;
     PyObject *k, *v;
     /* Clearing the cache is delicate.
 
Index: src/persistent/cPersistence.c
===================================================================
--- src/persistent/cPersistence.c	(revision 80887)
+++ src/persistent/cPersistence.c	(working copy)
@@ -300,7 +300,7 @@
 {
     PyObject *copy, *key, *value;
     char *ckey;
-    int pos = 0;
+    Py_ssize_t pos = 0;
 
     copy = PyDict_New();
     if (!copy)
@@ -414,7 +414,7 @@
 pickle_setattrs_from_dict(PyObject *self, PyObject *dict)
 {
     PyObject *key, *value;
-    int pos = 0;
+    Py_ssize_t pos = 0;
 
     if (!PyDict_Check(dict)) {
 	PyErr_SetString(PyExc_TypeError, "Expected dictionary");
Index: src/persistent/cPersistence.h
===================================================================
--- src/persistent/cPersistence.h	(revision 80887)
+++ src/persistent/cPersistence.h	(working copy)
@@ -16,6 +16,14 @@
 #define CPERSISTENCE_H
 
 #include "Python.h"
+
+/* Make use of Py_ssize_t possibble with python versions < 2.5. Gerald Klix(2007-16-10) */
+#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
+typedef int Py_ssize_t;
+#define PY_SSIZE_T_MAX INT_MAX
+#define PY_SSIZE_T_MIN INT_MIN
+#endif
+
 #include "ring.h"
 
 #define CACHE_HEAD \