diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 44b2d11..81d3294 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -658,7 +658,7 @@
 
 #ifdef CTYPES_UNICODE
     if (PyUnicode_Check(obj)) {
-#ifdef HAVE_USABLE_WCHAR_T
+#if Py_UNICODE_SIZE == SIZEOF_WCHAR_T
         pa->ffi_type = &ffi_type_pointer;
         pa->value.p = PyUnicode_AS_UNICODE(obj);
         Py_INCREF(obj);
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index b83447b..3d7d0bc 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -1420,12 +1420,11 @@
         return NULL;
     } else
         Py_INCREF(value);
-#ifdef HAVE_USABLE_WCHAR_T
-    /* HAVE_USABLE_WCHAR_T means that Py_UNICODE and wchar_t is the same
-       type.  So we can copy directly.  Hm, are unicode objects always NUL
+#if Py_UNICODE_SIZE == SIZEOF_WCHAR_T
+    /* We can copy directly.  Hm, are unicode objects always NUL
        terminated in Python, internally?
      */
-    *(wchar_t **)ptr = PyUnicode_AS_UNICODE(value);
+    *(wchar_t **)ptr = (wchar_t *) PyUnicode_AS_UNICODE(value);
     return value;
 #else
     {
diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index 88f6add..2394206 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -289,15 +289,15 @@
     wchar_t *s, *buf = NULL;
     size_t n1, n2;
     PyObject *result = NULL;
-#ifndef HAVE_USABLE_WCHAR_T
+#if Py_UNICODE_SIZE != SIZEOF_WCHAR_T
     Py_ssize_t i;
 #endif
 
     if (!PyArg_ParseTuple(args, "u#:strxfrm", &s0, &n0))
         return NULL;
 
-#ifdef HAVE_USABLE_WCHAR_T
-    s = s0;
+#if Py_UNICODE_SIZE == SIZEOF_WCHAR_T
+    s = (wchar_t *) s0;
 #else
     s = PyMem_Malloc((n0+1)*sizeof(wchar_t));
     if (!s)
@@ -326,7 +326,7 @@
     result = PyUnicode_FromWideChar(buf, n2);
  exit:
     if (buf) PyMem_Free(buf);
-#ifndef HAVE_USABLE_WCHAR_T
+#if Py_UNICODE_SIZE != SIZEOF_WCHAR_T
     PyMem_Free(s);
 #endif
     return result;
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index c50f601..4c4b43c 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -664,7 +664,7 @@
         return NULL;
 
     /* Copy the wchar_t data into the new object */
-#ifdef HAVE_USABLE_WCHAR_T
+#if Py_UNICODE_SIZE == SIZEOF_WCHAR_T
     memcpy(unicode->str, w, size * sizeof(wchar_t));
 #else
     {
@@ -1167,7 +1167,7 @@
     if (size > PyUnicode_GET_SIZE(unicode))
         size = PyUnicode_GET_SIZE(unicode) + 1;
 
-#ifdef HAVE_USABLE_WCHAR_T
+#if Py_UNICODE_SIZE == SIZEOF_WCHAR_T
     memcpy(w, unicode->str, size * sizeof(wchar_t));
 #else
     {