diff --git a/lib/components/UploadPage.js b/lib/components/UploadPage.js
index a4da103..d7a491c 100644
--- a/lib/components/UploadPage.js
+++ b/lib/components/UploadPage.js
@@ -89,7 +89,7 @@ export default class UploadPage extends React.Component {
           {keys.length > 0 ? <p>Download Progress</p> : null}
           <div className="data">
             {keys.map((key) => {
-              return <ProgressBar small value={this.state.peerProgress[key]} />
+              return <ProgressBar small key={key} value={this.state.peerProgress[key]} />
             })}
           </div>