diff --git a/app/templates/config_cas.j2 b/app/templates/config_cas.j2
index 14b4569555..6ca3020ba8 100644
--- a/app/templates/config_cas.j2
+++ b/app/templates/config_cas.j2
@@ -11,7 +11,7 @@
 <div class="row">
     <div class="col-md-8">
 
-        <form class="form form-horizontal" method="post" role="form">
+        <form class="form form-horizontal" method="post" enctype="multipart/form-data" role="form">
         {{ form.hidden_tag() }}
         {{ wtf.form_errors(form, hiddens="only") }}