diff --git a/ui/src/components/comment-nodes.tsx b/ui/src/components/comment-nodes.tsx
index b15da520..ebbef8fa 100644
--- a/ui/src/components/comment-nodes.tsx
+++ b/ui/src/components/comment-nodes.tsx
@@ -38,6 +38,7 @@ export class CommentNodes extends Component<
       <div className="comments">
         {this.sorter().map(node => (
           <CommentNode
+            key={node.comment.id}
             node={node}
             noIndent={this.props.noIndent}
             viewOnly={this.props.viewOnly}
diff --git a/ui/src/components/post.tsx b/ui/src/components/post.tsx
index ed1ba302..0485975a 100644
--- a/ui/src/components/post.tsx
+++ b/ui/src/components/post.tsx
@@ -300,7 +300,7 @@ export class Post extends Component<any, PostState> {
     i.setState(i.state);
   }
 
-  private buildCommentsTree(): Array<CommentNodeI> {
+  buildCommentsTree(): Array<CommentNodeI> {
     let map = new Map<number, CommentNodeI>();
     for (let comment of this.state.comments) {
       let node: CommentNodeI = {