diff --git a/TEMPLATE/libtofs.jinja b/TEMPLATE/libtofs.jinja
index 900e62b5..23c5c606 100644
--- a/TEMPLATE/libtofs.jinja
+++ b/TEMPLATE/libtofs.jinja
@@ -78,7 +78,7 @@
     {#- Use the default, new method otherwise #}
     {%- set fsl = salt['config.get'](
         tplroot ~ path_prefix_ext|replace('/', ':') ~ ':files_switch',
-        files_switch_list
+        files_switch_list.copy()
     ) %}
     {#- Append an empty value to evaluate as `default` in the loop below #}
     {%- if '' not in fsl %}