1 files changed, 11 insertions, 5 deletions
diff --git a/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol b/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol
index 9dc9e6525..944068bbb 100644
--- a/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol
+++ b/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol
@@ -24,9 +24,10 @@ import "../../tokens/ERC721Token/ERC721Token.sol";
 import "./libs/LibTransferErrors.sol";
 
 contract MixinERC721Transfer is
-    LibBytes,
     LibTransferErrors
 {
+    using LibBytes for bytes;
+    
     /// @dev Internal version of `transferFrom`.
     /// @param assetData Encoded byte array.
     /// @param from Address to transfer asset from.
@@ -53,7 +54,12 @@ contract MixinERC721Transfer is
             bytes memory receiverData
         ) = decodeERC721AssetData(assetData);
 
-        ERC721Token(token).safeTransferFrom(from, to, tokenId, receiverData);
+        ERC721Token(token).safeTransferFrom(
+            from,
+            to,
+            tokenId,
+            receiverData
+        );
     }
 
     /// @dev Decodes ERC721 Asset data.
@@ -73,10 +79,10 @@ contract MixinERC721Transfer is
         )
     {
         // Decode asset data.
-        token = readAddress(assetData, 0);
-        tokenId = readUint256(assetData, 20);
+        token = assetData.readAddress(0);
+        tokenId = assetData.readUint256(20);
         if (assetData.length > 52) {
-            receiverData = readBytes(assetData, 52);
+            receiverData = assetData.readBytesWithLength(52);
         }
 
         return (