diff --git a/Misc/NEWS.d/next/Tests/2018-09-09-14-36-59.bpo-34569.okj1Xh.rst b/Misc/NEWS.d/next/Tests/2018-09-09-14-36-59.bpo-34569.okj1Xh.rst
new file mode 100644
index 00000000000000..bd433adfc357ae
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2018-09-09-14-36-59.bpo-34569.okj1Xh.rst
@@ -0,0 +1,2 @@
+The experimental PEP 554 data channels now correctly pass negative PyLong
+objects between subinterpreters on 32-bit systems. Patch by Michael Felt.
diff --git a/Python/pystate.c b/Python/pystate.c
index 7a4cd48077f3b1..fc2f7efd5d9811 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -1426,7 +1426,7 @@ _str_shared(PyObject *obj, _PyCrossInterpreterData *data)
 static PyObject *
 _new_long_object(_PyCrossInterpreterData *data)
 {
-    return PyLong_FromLongLong((int64_t)(data->data));
+    return PyLong_FromLongLong((intptr_t)(data->data));
 }
 
 static int