diff --git a/book/theme/index.hbs b/book/theme/index.hbs
index 2fb49c86..62a78cd4 100644
--- a/book/theme/index.hbs
+++ b/book/theme/index.hbs
@@ -156,7 +156,7 @@
                             <li role="none"><button role="menuitem" class="theme" id="mdbook-theme-coal">Coal</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="mdbook-theme-navy">Navy</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="mdbook-theme-ayu">Ayu</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="colibri">Colibri</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="mdbook-theme-colibri">Colibri</button></li>
                         </ul>
                         {{#if search_enabled}}
                         <button id="mdbook-search-toggle" class="icon-button" type="button" title="Search (`/`)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="/ s" aria-controls="mdbook-searchbar">