diff --git a/frontend/static/js/views/MatchMakingView.js b/frontend/static/js/views/MatchMakingView.js
index d85d894..c6c1404 100644
--- a/frontend/static/js/views/MatchMakingView.js
+++ b/frontend/static/js/views/MatchMakingView.js
@@ -64,7 +64,7 @@ export default class extends AbstractAuthenticatedView {
         });
 
         let update = () => {
-            button.disabled = (input.value < 2 || input.value > 4);
+            this.button.disabled = (this.input.value < 2 || this.input.value > 4);
         };
 
         ["change", "oninput"].forEach((event_name) => {