Index: Modules/_elementtree.c
===================================================================
--- Modules/_elementtree.c      (revision 84989)
+++ Modules/_elementtree.c      (working copy)
@@ -693,7 +693,7 @@
     }
 
     /* add object to memo dictionary (so deepcopy won't visit it again) */
-    id = PyLong_FromLong((Py_uintptr_t) self);
+    id = PyLong_FromVoidPtr(self);
     if (!id)
         goto error;
 
@@ -1219,7 +1219,7 @@
 element_setitem(PyObject* self_, Py_ssize_t index, PyObject* item)
 {
     ElementObject* self = (ElementObject*) self_;
-    int i;
+    Py_ssize_t i;
     PyObject* old;
 
     if (!self->extra || index < 0 || index >= self->extra->length) {
@@ -1369,7 +1369,7 @@
 
         /* Resize before creating the recycle bin, to prevent refleaks. */
         if (newlen > slicelen) {
-            if (element_resize(self, newlen - slicelen) < 0) {
+            if (element_resize(self, (int)(newlen - slicelen)) < 0) {
                 if (seq) {
                     Py_DECREF(seq);
                 }
@@ -1411,7 +1411,7 @@
             self->extra->children[cur] = element;
         }
 
-        self->extra->length += newlen - slicelen;
+        self->extra->length += (int)(newlen - slicelen);
 
         if (seq) {
             Py_DECREF(seq);
@@ -2073,7 +2073,7 @@
     /* convert a UTF-8 tag/attribute name from the expat parser
        to a universal name string */
 
-    int size = strlen(string);
+    Py_ssize_t size = strlen(string);
     PyObject* key;
     PyObject* value;
 
@@ -2092,7 +2092,7 @@
 
         PyObject* tag;
         char* p;
-        int i;
+        Py_ssize_t i;
 
         /* look for namespace separator */
         for (i = 0; i < size; i++)
@@ -2660,7 +2660,7 @@
         }
 
         res = expat_parse(
-            self, PyBytes_AS_STRING(buffer), PyBytes_GET_SIZE(buffer), 0
+            self, PyBytes_AS_STRING(buffer), (int)PyBytes_GET_SIZE(buffer), 0
             );
 
         Py_DECREF(buffer);