diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index ce8129d..3d52bed 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -452,8 +452,8 @@
 		stream = PyObject_CallMethod(io, "open", "ssis",
 					     tok->filename, "r", -1, enc);
 	else
-		stream = PyObject_CallMethod(io, "open", "isis",
-				fileno(tok->fp), "r", -1, enc);
+		stream = PyObject_CallMethod(io, "open", "isisOOO",
+				fileno(tok->fp), "r", -1, enc, Py_None, Py_None, Py_False);
 	if (stream == NULL)
 		goto cleanup;