diff --git a/src/js/plugins/grid.js b/src/js/plugins/grid.js
index 3cbbd93..5795ab6 100644
--- a/src/js/plugins/grid.js
+++ b/src/js/plugins/grid.js
@@ -41,7 +41,7 @@ export default class Grid {
    */
   onKeyPress_(event) {
     if (event.which === Keys.ENTER) {
-      document.body.toggleClass('baseline');
+      document.body.classList.toggle('baseline');
     }
   }
 }