Merge branches/pep-0384.
diff --git a/Objects/listobject.c b/Objects/listobject.c
index fbc05fd..bcc6bc0 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2397,7 +2397,7 @@
         PyObject* it;
         PyObject **src, **dest;
 
-        if (PySlice_GetIndicesEx((PySliceObject*)item, Py_SIZE(self),
+        if (PySlice_GetIndicesEx(item, Py_SIZE(self),
                          &start, &stop, &step, &slicelength) < 0) {
             return NULL;
         }
@@ -2446,7 +2446,7 @@
     else if (PySlice_Check(item)) {
         Py_ssize_t start, stop, step, slicelength;
 
-        if (PySlice_GetIndicesEx((PySliceObject*)item, Py_SIZE(self),
+        if (PySlice_GetIndicesEx(item, Py_SIZE(self),
                          &start, &stop, &step, &slicelength) < 0) {
             return -1;
         }