diff --git a/inline_conditions.module b/inline_conditions.module
index 93d6ce0..0e6e761 100644
--- a/inline_conditions.module
+++ b/inline_conditions.module
@@ -438,7 +438,7 @@ function inline_conditions_field_widget_form(&$form, &$form_state, $field, $inst
     $id = 'inline-conditions-' . $field['field_name'] . '-' . $instance['id'] . '-' . $delta;
     $element[$delta] = array(
       '#type' => 'container',
-      '#prefix' => '<div id="' . $id . '" class="container-inline ' . $field['field_name'] . ' ' . $zebra_class . ' clearfix">',
+      '#prefix' => '<div id="' . $id . '" class="container-inline ' . $field['field_name'] . ' ' . $zebra_class . ' clearfix ' . drupal_clean_css_identifier($condition_name) . '">',
       '#suffix' => '</div>',
     );
     $element[$delta]['condition_name'] = array(