diff --git a/js/components/ascribe_uploader/react_s3_fine_uploader.js b/js/components/ascribe_uploader/react_s3_fine_uploader.js
index 877146a5..feb0479d 100644
--- a/js/components/ascribe_uploader/react_s3_fine_uploader.js
+++ b/js/components/ascribe_uploader/react_s3_fine_uploader.js
@@ -36,17 +36,11 @@ const ReactS3FineUploader = React.createClass({
         keyRoutine: shape({
             url: string,
             fileClass: string,
-            pieceId: oneOfType([
-                string,
-                number
-            ])
+            pieceId: number
         }),
         createBlobRoutine: shape({
             url: string,
-            pieceId: oneOfType([
-                string,
-                number
-            ])
+            pieceId: number
         }),
         handleChangedFile: func, // is for when a file is dropped or selected
         submitFile: func, // is for when a file has been successfully uploaded, TODO: rename to handleSubmitFile
diff --git a/js/components/whitelabel/wallet/components/market/market_forms/market_additional_data_form.js b/js/components/whitelabel/wallet/components/market/market_forms/market_additional_data_form.js
index 6982e539..8a6825b4 100644
--- a/js/components/whitelabel/wallet/components/market/market_forms/market_additional_data_form.js
+++ b/js/components/whitelabel/wallet/components/market/market_forms/market_additional_data_form.js
@@ -28,10 +28,7 @@ import { getLangText } from '../../../../../../utils/lang_utils';
 
 let MarketAdditionalDataForm = React.createClass({
     propTypes: {
-        pieceId: React.PropTypes.oneOfType([
-            React.PropTypes.number,
-            React.PropTypes.string
-        ]),
+        pieceId: React.PropTypes.number,
         editable: React.PropTypes.bool,
         isInline: React.PropTypes.bool,
         showHeading: React.PropTypes.bool,