diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index ee1973a..605a152 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -404,7 +404,7 @@
         Py_INCREF(Py_None);
     }
     for(i=0; i < num_fields; i++) {
-        PyObject *field = PyString_FromString(fields[i]);
+        PyObject *field = PyUnicode_FromString(fields[i]);
         if (!field) {
             Py_DECREF(fnames);
             return NULL;
@@ -423,7 +423,7 @@
     PyObject *s, *l = PyList_New(num_fields);
     if (!l) return 0;
     for(i = 0; i < num_fields; i++) {
-        s = PyString_FromString(attrs[i]);
+        s = PyUnicode_FromString(attrs[i]);
         if (!s) {
             Py_DECREF(l);
             return 0;