diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 576498245b9d..6fe6dbd0c740 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -271,7 +271,7 @@ repeat:
 				break;
 			}
 			len = rr->len - 5;
-			if (retnamlen + len >= 254) {
+			if (retnamlen + len > NAME_MAX) {
 				truncate = 1;
 				break;
 			}