diff --git a/Python/Python-tokenize.c b/Python/Python-tokenize.c
index cb050e77b1520d..664e7d8a50af8c 100644
--- a/Python/Python-tokenize.c
+++ b/Python/Python-tokenize.c
@@ -313,6 +313,7 @@ static void
 tokenizeriter_dealloc(tokenizeriterobject *it)
 {
     PyTypeObject *tp = Py_TYPE(it);
+    Py_XDECREF(it->last_line);
     _PyTokenizer_Free(it->tok);
     tp->tp_free(it);
     Py_DECREF(tp);