diff --git a/contracts/CurioERC1155Wrapper.sol b/contracts/CurioERC1155Wrapper.sol
index 16965fa..dc6c283 100644
--- a/contracts/CurioERC1155Wrapper.sol
+++ b/contracts/CurioERC1155Wrapper.sol
@@ -5,11 +5,12 @@ import "./ERC1155.sol";
 import "./IMastersFedi.sol";
 import "./Address.sol";
 import "./IERC1155Metadata.sol";
+import "./ERC1155Metadata.sol";
 import "@openzeppelin/contracts/utils/Strings.sol"; 
 import "@openzeppelin/contracts/utils/Base64.sol"; 
 import "@openzeppelin/contracts/access/Ownable.sol";
 
-contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, Ownable {
+contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, Ownable {
     using Address for address;
 
     mapping (uint256 => address) public contracts;
@@ -73,6 +74,16 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, Ownable {
         urls[_id] = _url;
     }
 
+    /**
+        @notice Query if a contract implements an interface
+        @param _interfaceId  The interface identifier, as specified in ERC-165
+        @return `true` if the contract implements `_interfaceId`
+    */
+    function supportsInterface(bytes4 _interfaceId) public pure override(ERC1155, ERC1155Metadata) returns (bool) {
+        return ERC1155.supportsInterface(_interfaceId)
+            || ERC1155Metadata.supportsInterface(_interfaceId);
+    }
+
     /**
         @notice If NFT ID exists
         @dev Makes OpenSea happy
@@ -161,7 +172,7 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, Ownable {
         IMastersFedi curio = IMastersFedi(tokenContract);
 
         require(balances[_id][msg.sender] >= _quantity, "insufficient balance");
-        balances[_id][msg.sender] -= _quantity;
+        balances[_id][msg.sender] -=     _quantity;
 
         curio.transfer(msg.sender, _quantity);
 
diff --git a/contracts/ERC1155.sol b/contracts/ERC1155.sol
index 86bb542..d413fed 100644
--- a/contracts/ERC1155.sol
+++ b/contracts/ERC1155.sol
@@ -36,6 +36,7 @@ contract ERC1155 is IERC1155, ERC165, CommonConstants
     function supportsInterface(bytes4 _interfaceId)
     public
     pure
+    virtual
     returns (bool) {
          if (_interfaceId == INTERFACE_SIGNATURE_ERC165 ||
              _interfaceId == INTERFACE_SIGNATURE_ERC1155) {
diff --git a/contracts/ERC1155Metadata.sol b/contracts/ERC1155Metadata.sol
new file mode 100644
index 0000000..9d1018f
--- /dev/null
+++ b/contracts/ERC1155Metadata.sol
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity ^0.8.17;
+
+import "./IERC1155Metadata.sol";
+
+contract ERC1155Metadata {
+
+  /**
+    @notice Query if a contract implements an interface
+    @param _interfaceId  The interface identifier, as specified in ERC-165
+    @return `true` if the contract implements `_interfaceID`
+  */
+  function supportsInterface(bytes4 _interfaceId) public virtual pure returns (bool) {
+    if (_interfaceId == type(ERC1155Metadata_URI).interfaceId) {
+      return true;
+    }
+    else return false;
+  }
+}