diff --git a/website/agenda/planung/roles.cgi b/website/agenda/planung/roles.cgi
index 8cdf4b3..e9a92f4 100755
--- a/website/agenda/planung/roles.cgi
+++ b/website/agenda/planung/roles.cgi
@@ -128,7 +128,9 @@ sub save_roles {
                     || $column eq 'role'
                     || $column eq 'id'
                     || $column eq 'project_id'
-                    || $column eq 'studio_id' );
+                    || $column eq 'studio_id'
+                    || $column eq 'created_at'
+                    );
                 $values->{$id}->{$column} = 0;
             }
         }