diff --git a/web/viewer.html b/web/viewer.html
index 6aed6ff84..892c071b4 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -344,6 +344,7 @@ See https://github.com/adobe-type-tools/cmap-resources
                 <div id="editorModeButtons" class="splitToolbarButton toggled" role="radiogroup">
                   <button id="editorHighlight" class="toolbarButton" hidden="true" disabled="disabled" title="Highlight" role="radio" aria-checked="false" aria-controls="editorHighlightParamsToolbar" tabindex="31" data-l10n-id="pdfjs-editor-highlight">
                     <span data-l10n-id="pdfjs-editor-highlight-label">Highlight</span>
+                  </button>
                   <button id="editorFreeText" class="toolbarButton" disabled="disabled" title="Text" role="radio" aria-checked="false" aria-controls="editorFreeTextParamsToolbar" tabindex="32" data-l10n-id="pdfjs-editor-free-text-button">
                     <span data-l10n-id="pdfjs-editor-free-text-button-label">Text</span>
                   </button>