diff --git a/Python/marshal.c b/Python/marshal.c
index c749bb3..35fcd3a 100644
--- a/Python/marshal.c
+++ b/Python/marshal.c
@@ -1339,6 +1339,7 @@
         rf.depth = 0;
         rf.fp = NULL;
         rf.readable = f;
+        rf.current_filename = NULL;
         result = read_object(&rf);
     }
     Py_DECREF(data);