diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 446520a..440d35a 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -3323,7 +3323,7 @@
     wchar_t *wstr;
     PyObject *bytes = NULL;
     char *errmsg;
-    PyObject *reason;
+    PyObject *reason = NULL;
     PyObject *exc;
     size_t error_pos;
     int surrogateescape;