diff --git a/includes/form.inc b/includes/form.inc
index c2d3adf..1a91bca 100644
--- a/includes/form.inc
+++ b/includes/form.inc
@@ -248,6 +248,9 @@ function bootstrap_preprocess_button(&$vars) {
         $vars['element']['#attributes']['class'][] = $class;
         break;
       }
+      else {
+        $vars['element']['#attributes']['class'][] = 'btn-default';
+      }
     }
   }
 }
diff --git a/includes/theme.inc b/includes/theme.inc
index d03126b..5c362ab 100644
--- a/includes/theme.inc
+++ b/includes/theme.inc
@@ -126,7 +126,7 @@ function theme_bootstrap_links($variables) {
  * theme_bootstrap_btn_dropdown
  */
 function theme_bootstrap_btn_dropdown($variables) {
-  $type_class = '';
+  $type_class = 'btn-default';
   $sub_links ='';
 
   $variables['attributes']['class'][] = 'btn-group';