diff --git a/contracts/token/ERC721/ERC721.sol b/contracts/token/ERC721/ERC721.sol
index b8f487b07..8d93cc5a9 100644
--- a/contracts/token/ERC721/ERC721.sol
+++ b/contracts/token/ERC721/ERC721.sol
@@ -113,7 +113,7 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
         address owner = ERC721.ownerOf(tokenId);
         require(to != owner, "ERC721: approval to current owner");
 
-        require(_msgSender() == owner || ERC721.isApprovedForAll(owner, _msgSender()),
+        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
             "ERC721: approve caller is not owner nor approved for all"
         );
 
@@ -216,7 +216,7 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
     function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
         require(_exists(tokenId), "ERC721: operator query for nonexistent token");
         address owner = ERC721.ownerOf(tokenId);
-        return (spender == owner || getApproved(tokenId) == spender || ERC721.isApprovedForAll(owner, spender));
+        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
     }
 
     /**