diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 9c02817..68278e6 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1185,6 +1185,10 @@
 unicode_resizable(PyObject *unicode)
 {
     Py_ssize_t len;
+#if SIZEOF_WCHAR_T == 2
+    /* FIXME: unicode_resize() is buggy on Windows */
+    return 0;
+#endif
     if (Py_REFCNT(unicode) != 1)
         return 0;
     if (PyUnicode_CHECK_INTERNED(unicode))