diff --git a/dicos/70_prometheus.xml b/dicos/70_prometheus.xml
index ee09e12..d78fb7e 100644
--- a/dicos/70_prometheus.xml
+++ b/dicos/70_prometheus.xml
@@ -33,7 +33,7 @@
 	    <variable name='job_name_node' type='string' description="Nom du job pour les noeuds" mode='expert'>
 		<value>node</value>
 	    </variable>
-	    <variable name='job_file_config' type='string' description="Emplacement des fichiers de configuration des noeuds" mode='expert'>
+	    <variable name='job_file_config' type='string' description="Emplacement des fichiers de configuration des noeuds" auto_freeze='True' mode='expert' mandatory='True'>
                 <value>/etc/prometheus/nodes</value>
             </variable>
         </family>