diff --git a/app/views/exercises/_file_form.html.slim b/app/views/exercises/_file_form.html.slim
index 3c43cd65..b1c292cd 100644
--- a/app/views/exercises/_file_form.html.slim
+++ b/app/views/exercises/_file_form.html.slim
@@ -2,7 +2,7 @@
 
 li.panel.panel-default
   .panel-heading role="tab" id="heading"
-    a.file-heading data-toggle="collapse" data-parent="#files" href="#collapse#{id}"
+    a.file-heading data-toggle="collapse" href="#collapse#{id}"
       div.clearfix role="button"
         span = f.object.name
   .panel-collapse.collapse id="collapse#{id}" role="tabpanel"