diff --git a/EIPS/eip-721.md b/EIPS/eip-721.md
index f106f9187bff5a..ae2ef6633d79df 100644
--- a/EIPS/eip-721.md
+++ b/EIPS/eip-721.md
@@ -394,8 +394,8 @@ XXXXERC721, by William Entriken -- a scalable example implementation
 1. ERC-20 Token Standard. https://eips.ethereum.org/EIPS/eip-20
 1. ERC-165 Standard Interface Detection. https://eips.ethereum.org/EIPS/eip-165
 1. ERC-173 Owned Standard. https://eips.ethereum.org/EIPS/eip-173
-1. ERC-223 Token Standard. https://eips.ethereum.org/EIPS/eip-223
-1. ERC-677 `transferAndCall` Token Standard. https://eips.ethereum.org/EIPS/eip-677
+1. ERC-223 Token Standard. https://github.com/ethereum/EIPs/issues/223
+1. ERC-677 `transferAndCall` Token Standard. https://github.com/ethereum/EIPs/issues/677
 1. ERC-827 Token Standard. https://eips.ethereum.org/EIPS/eip-827
 1. Ethereum Name Service (ENS). https://ens.domains
 1. Instagram -- What's the Image Resolution? https://help.instagram.com/1631821640426723