diff --git a/js/build_page.js b/js/build_page.js
index 61e7505..d281c58 100644
--- a/js/build_page.js
+++ b/js/build_page.js
@@ -266,7 +266,7 @@
     });
 
     document.getElementById("send-button").addEventListener('click', function (el) {
-        el.classList.add('is-loading');
+        document.getElementById("send-button").classList.add('is-loading');
         sendForm();
     });
 }