diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index aa60cbe7066ca8f3b720cca8e25aec6e0e046c8f..fc1f0abb8fe463ae3d68f7fbe84f5aab47cf1200 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1336,7 +1336,7 @@ static int gen_unique_name(struct send_ctx *sctx,
 		return -ENOMEM;
 
 	while (1) {
-		len = snprintf(tmp, sizeof(tmp) - 1, "o%llu-%llu-%llu",
+		len = snprintf(tmp, sizeof(tmp), "o%llu-%llu-%llu",
 				ino, gen, idx);
 		if (len >= sizeof(tmp)) {
 			/* should really not happen */