diff --git a/src/lobby/Lobby.js b/src/lobby/Lobby.js
index 846b6fb..db8b09e 100644
--- a/src/lobby/Lobby.js
+++ b/src/lobby/Lobby.js
@@ -81,7 +81,7 @@ export default class Lobby {
             }
         };
         gn('blockstab').onclick = function () {
-            if (gn('booktab').className != 'tab on') {
+            if (gn('blockstab').className != 'tab on') {
                 Lobby.setSubMenu('blocks');
             }
         };