--- a/torch/csrc/jit/python/python_list.cpp.orig
+++ b/torch/csrc/jit/python/python_list.cpp
@@ -28,7 +28,11 @@
 
 namespace {
 py::list scriptListToPyList(const ScriptList& src) {
+#ifndef __LP64__
+  py::list out(static_cast<ptrdiff_t>(src.len()));
+#else
   py::list out(src.len());
+#endif
   auto iter = src.iter();
 
   size_t i = 0;