diff --git a/Misc/NEWS.d/next/Core and Builtins/2020-01-19-11-26-04.bpo-1635741.v8SgAj.rst b/Misc/NEWS.d/next/Core and Builtins/2020-01-19-11-26-04.bpo-1635741.v8SgAj.rst
new file mode 100644
index 00000000000000..06f748eb3e0bee
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2020-01-19-11-26-04.bpo-1635741.v8SgAj.rst	
@@ -0,0 +1 @@
+Port _collections extension module to multiphase initialization (:pep:`489`).
\ No newline at end of file
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 1d23973fd05661..4d95c6f5930098 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -2518,55 +2518,60 @@ static struct PyMethodDef module_functions[] = {
     {NULL,       NULL}          /* sentinel */
 };
 
-static struct PyModuleDef _collectionsmodule = {
-    PyModuleDef_HEAD_INIT,
-    "_collections",
-    module_doc,
-    -1,
-    module_functions,
-    NULL,
-    NULL,
-    NULL,
-    NULL
-};
-
-PyMODINIT_FUNC
-PyInit__collections(void)
+static int
+_collections_exec(PyObject *module)
 {
-    PyObject *m;
-
-    m = PyModule_Create(&_collectionsmodule);
-    if (m == NULL)
-        return NULL;
-
     if (PyType_Ready(&deque_type) < 0)
-        return NULL;
+        return -1;
     Py_INCREF(&deque_type);
-    PyModule_AddObject(m, "deque", (PyObject *)&deque_type);
+    PyModule_AddObject(module, "deque", (PyObject *)&deque_type);
 
     defdict_type.tp_base = &PyDict_Type;
     if (PyType_Ready(&defdict_type) < 0)
-        return NULL;
+        return -1;
     Py_INCREF(&defdict_type);
-    PyModule_AddObject(m, "defaultdict", (PyObject *)&defdict_type);
+    PyModule_AddObject(module, "defaultdict", (PyObject *)&defdict_type);
 
     Py_INCREF(&PyODict_Type);
-    PyModule_AddObject(m, "OrderedDict", (PyObject *)&PyODict_Type);
+    PyModule_AddObject(module, "OrderedDict", (PyObject *)&PyODict_Type);
 
     if (PyType_Ready(&dequeiter_type) < 0)
-        return NULL;
+        return -1;
     Py_INCREF(&dequeiter_type);
-    PyModule_AddObject(m, "_deque_iterator", (PyObject *)&dequeiter_type);
+    PyModule_AddObject(module, "_deque_iterator", (PyObject *)&dequeiter_type);
 
     if (PyType_Ready(&dequereviter_type) < 0)
-        return NULL;
+        return -1;
     Py_INCREF(&dequereviter_type);
-    PyModule_AddObject(m, "_deque_reverse_iterator", (PyObject *)&dequereviter_type);
+    PyModule_AddObject(module, "_deque_reverse_iterator", (PyObject *)&dequereviter_type);
 
     if (PyType_Ready(&tuplegetter_type) < 0)
-        return NULL;
+        return -1;
     Py_INCREF(&tuplegetter_type);
-    PyModule_AddObject(m, "_tuplegetter", (PyObject *)&tuplegetter_type);
+    PyModule_AddObject(module, "_tuplegetter", (PyObject *)&tuplegetter_type);
+
+    return 0;
+}
+
+static PyModuleDef_Slot _collections_slots[] = {
+    {Py_mod_exec, _collections_exec},
+    {0, NULL}
+};
 
-    return m;
+static struct PyModuleDef _collectionsmodule = {
+    PyModuleDef_HEAD_INIT,
+    "_collections",
+    module_doc,
+    0,
+    module_functions,
+    _collections_slots,
+    NULL,
+    NULL,
+    NULL
+};
+
+PyMODINIT_FUNC
+PyInit__collections(void)
+{
+    return PyModuleDef_Init(&_collectionsmodule);
 }