diff --git a/flextype/core/Forms.php b/flextype/core/Forms.php
index 1c8d962e..dd11d6ed 100644
--- a/flextype/core/Forms.php
+++ b/flextype/core/Forms.php
@@ -109,7 +109,7 @@ class Forms
 
             // Go through all sections and create nav tabs
             foreach ($fieldset['sections'] as $key => $section) {
-                $form .= '<div class="tab-pane fade show ' . ($key === 'main' ? 'active' : '') . '" id="pills-' . $key . '" role="tabpanel" aria-labelledby="pills-' . $key . '-tab">';
+                $form .= '<div class="tab-pane fade  ' . ($key === 'main' ? 'show active' : '') . '" id="pills-' . $key . '" role="tabpanel" aria-labelledby="pills-' . $key . '-tab">';
                 $form .= '<div class="row">';
 
                 foreach ($section['fields'] as $element => $property) {