diff --git a/contracts/plasma/RootChain.sol b/contracts/plasma/RootChain.sol
index bc455dd..fac12e6 100644
--- a/contracts/plasma/RootChain.sol
+++ b/contracts/plasma/RootChain.sol
@@ -614,17 +614,12 @@ contract RootChain is ERC721Receiver {
 
     /******************** ERC721 ********************/
 
-    function onERC721Received(
-        address _operator,
-        address _from,
-        uint256 _tokenId,
-        bytes _data
-    )
+    function onERC721Received(address _from, uint256 _uid, bytes)
         public
         isTokenApproved(msg.sender)
         returns(bytes4)
     {
-        deposit(_from, uint64(_tokenId), uint32(1));
+        deposit(_from, uint64(_uid), uint32(1));
         return ERC721_RECEIVED;
     }
 
diff --git a/package.json b/package.json
index 18944e4..fe308bb 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "jquery": "^3.3.1",
     "lodash": "^4.17.10",
     "loom-js": "^1.14.0",
-    "openzeppelin-solidity": "^1.11.0",
+    "openzeppelin-solidity": "1.10.0",
     "react": "^16.3.2",
     "react-blockies": "^1.3.0",
     "react-bootstrap": "^0.32.1",