diff --git a/Misc/NEWS.d/next/Tests/2020-06-23-12-02-45.bpo-41085.JZKsyz.rst b/Misc/NEWS.d/next/Tests/2020-06-23-12-02-45.bpo-41085.JZKsyz.rst
new file mode 100644
index 00000000000..463dffdd653
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2020-06-23-12-02-45.bpo-41085.JZKsyz.rst
@@ -0,0 +1,2 @@
+Fix integer overflow in the :meth:`array.array.index` method on 64-bit Windows
+for index larger than ``2**31``.
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 8f12c616463..2d498c7e829 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -1130,7 +1130,7 @@ array_array_index(arrayobject *self, PyObject *v)
         cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
         Py_DECREF(selfi);
         if (cmp > 0) {
-            return PyLong_FromLong((long)i);
+            return PyLong_FromSsize_t(i);
         }
         else if (cmp < 0)
             return NULL;