diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index e1063ef3dece..b0933d952593 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -397,10 +397,8 @@ static int fs_path_ensure_buf(struct fs_path *p, int len)
 	if (p->buf_len >= len)
 		return 0;
 
-	if (len > PATH_MAX) {
-		WARN_ON(1);
-		return -ENOMEM;
-	}
+	if (WARN_ON(len > PATH_MAX))
+		return -ENAMETOOLONG;
 
 	path_len = p->end - p->start;
 	old_buf_len = p->buf_len;