diff --git a/pkg/emscripten/webplayer.html b/pkg/emscripten/webplayer.html
index 111a773b20..5cb8eebbaf 100644
--- a/pkg/emscripten/webplayer.html
+++ b/pkg/emscripten/webplayer.html
@@ -60,6 +60,9 @@
            <li class="nav-item nxengine">
                <a class="nav-link" href="." onclick=switchCore("nxengine")>NX Engine</a>
             </li>
+           <li class="nav-item o2em">
+               <a class="nav-link" href="." onclick=switchCore("o2em")>O2EM</a>
+            </li>
            <li class="nav-item prboom">
                <a class="nav-link" href="." onclick=switchCore("prboom")>PrBoom</a>
             </li>