diff --git a/aldryn_gallery/templates/aldryn_gallery/base.html b/aldryn_gallery/templates/aldryn_gallery/base.html
index eb72bf1..ba48b47 100644
--- a/aldryn_gallery/templates/aldryn_gallery/base.html
+++ b/aldryn_gallery/templates/aldryn_gallery/base.html
@@ -2,7 +2,7 @@
 
 {# DOCS: http://getbootstrap.com/javascript/#carousel #}
 <div id="js-aldryn-gallery-{{ instance.pk }}" class="aldryn aldryn-gallery aldryn-gallery-{{ instance.style }}
-    carousel{% if instance.engine == 'fade' %} carousel-fade{% endif %} slide"
+    carousel{% if instance.engine == 'fade' %} carousel-fade{% endif %}{% if instance.engine == 'slide' %} slide{% endif %}"
     data-ride="carousel"
     data-duration="{{ instance.duration }}"
     data-interval="{{ instance.timeout }}">