diff --git a/fs/file.c b/fs/file.c
index c8f1b0af8e0004c8ca901e8e6babb5877fd5cc21..b3c6b82e6a9d8629446e77268a83a2c5c4eb1b62 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -240,7 +240,7 @@ static struct fdtable *alloc_fdtable(int nr)
 	if (!fdt)
   		goto out;
 
-	nfds = max_t(int, 8 * L1_CACHE_BYTES, roundup_pow_of_two(nfds));
+	nfds = max_t(int, 8 * L1_CACHE_BYTES, roundup_pow_of_two(nr + 1));
 	if (nfds > NR_OPEN)
 		nfds = NR_OPEN;