diff --git a/js/builder.es6.js b/js/builder.es6.js
index 94815ad9820c752ca04f133313765a30355d9aad..c59ff4cf39075537e71b81ddd3a410520ed1e51e 100644
--- a/js/builder.es6.js
+++ b/js/builder.es6.js
@@ -481,7 +481,7 @@
         $element
           .find('.js-lpb-region')
           .not('.is-dragula-enabled')
-          .addClass('.is-dragula-enabled')
+          .addClass('is-dragula-enabled')
           .get()
           .forEach((c) => {
             drake.containers.push(c);
diff --git a/js/builder.js b/js/builder.js
index f80db4318ad516d6e37d09b3a7be09910e465a33..a6ce6bd3e27c43e4bb0f80f5202a3a14bfc9771b 100644
--- a/js/builder.js
+++ b/js/builder.js
@@ -374,7 +374,7 @@ function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
           $element.trigger('lpb-builder:init');
         });
         var drake = $element.data('drake');
-        $element.find('.js-lpb-region').not('.is-dragula-enabled').addClass('.is-dragula-enabled').get().forEach(function (c) {
+        $element.find('.js-lpb-region').not('.is-dragula-enabled').addClass('is-dragula-enabled').get().forEach(function (c) {
           drake.containers.push(c);
         });
       });