Index: Modules/_pickle.c
===================================================================
--- Modules/_pickle.c	(revision 84147)
+++ Modules/_pickle.c	(working copy)
@@ -269,7 +269,7 @@
         if (Pdata_push((D), (O)) < 0) return (ER); } while(0)
 
 static PyObject *
-Pdata_poptuple(Pdata *self, Py_ssize_t start)
+Pdata_poptuple(Pdata *self, int start)
 {
     PyObject *tuple;
     Py_ssize_t len, i, j;
@@ -286,7 +286,7 @@
 }
 
 static PyObject *
-Pdata_poplist(Pdata *self, Py_ssize_t start)
+Pdata_poplist(Pdata *self, int start)
 {
     PyObject *list;
     Py_ssize_t len, i, j;
@@ -458,7 +458,7 @@
         }
         else {
             memcpy(self->write_buf + self->buf_size, s, n);
-            self->buf_size += n;
+            self->buf_size += (int)n;
             return n;
         }
     }
@@ -644,7 +644,7 @@
     if (!self->bin) {
         pdata[0] = PUT;
         PyOS_snprintf(pdata + 1, sizeof(pdata) - 1, "%ld\n", x);
-        len = strlen(pdata);
+        len = (int)strlen(pdata);
     }
     else {
         if (x < 256) {