1 files changed, 1 insertions, 1 deletions
diff --git a/marshal.c b/marshal.c
index a152010c20..f5115c4b29 100644
--- a/marshal.c
+++ b/marshal.c
@@ -446,7 +446,7 @@ marshal_dump(argc, argv)
     port = 0;
     rb_scan_args(argc, argv, "12", &obj, &a1, &a2);
     if (argc == 3) {
-	limit = NUM2INT(a2);
+	if (!NIL_P(a2)) limit = NUM2INT(a2);
 	port = a1;
     }
     else if (argc == 2) {