diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index a5d6135..00fd900 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -1462,7 +1462,7 @@ class TextIOWrapper(TextIOBase):
                     # Importing locale may fail if Python is being built
                     encoding = "ascii"
                 else:
-                    encoding = locale.getpreferredencoding()
+                    encoding = locale.getpreferredencoding(False)
 
         if not isinstance(encoding, str):
             raise ValueError("invalid encoding: %r" % encoding)
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 73d83a1..62dadd6 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -886,7 +886,7 @@ textiowrapper_init(textio *self, PyObject *args, PyObject *kwds)
         else {
           use_locale:
             self->encoding = PyObject_CallMethod(
-                state->locale_module, "getpreferredencoding", NULL);
+                state->locale_module, "getpreferredencoding", "O", Py_False);
             if (self->encoding == NULL) {
               catch_ImportError:
                 /*