diff --git a/app/views/exercises/_file_form.html.slim b/app/views/exercises/_file_form.html.slim
index 065eca66..3c43cd65 100644
--- a/app/views/exercises/_file_form.html.slim
+++ b/app/views/exercises/_file_form.html.slim
@@ -5,7 +5,7 @@ li.panel.panel-default
     a.file-heading data-toggle="collapse" data-parent="#files" href="#collapse#{id}"
       div.clearfix role="button"
         span = f.object.name
-  .panel-collapse.collapse-in id="collapse#{id}" role="tabpanel"
+  .panel-collapse.collapse id="collapse#{id}" role="tabpanel"
     .panel-body
       .clearfix = link_to(t('shared.destroy'), '#', class:'btn btn-warning btn-sm discard-file pull-right')
       .form-group