diff --git a/contracts/CurioERC1155Wrapper.sol b/contracts/CurioERC1155Wrapper.sol
index bef1694..deab02f 100644
--- a/contracts/CurioERC1155Wrapper.sol
+++ b/contracts/CurioERC1155Wrapper.sol
@@ -58,7 +58,8 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, O
                 '"image":"ipfs://', curio.ipfs_hash(), '",',
                 '"external_url":"', urls[_id], '",',
                 '"properties":{',
-                    '"symbol":"', curio.symbol(), '"',
+                    '"symbol":"', curio.symbol(), '",',
+                    '"erc20_contract":"', Strings.toHexString(contracts[_id]), '"',
                 '}',
             '}'
         ))));