diff --git a/update_psa.conf b/update_psa.conf
index 6268543..252db21 100644
--- a/update_psa.conf
+++ b/update_psa.conf
@@ -19,7 +19,7 @@
     "customer_id_"          :   "/etc/cust_nr",
 
     ""                      :   "machine id of PSA",
-    "machine_nr"            :   "/etc/mach_nr",
+    "machine_nr"            :   "/etc/machine_nr",
 
     ""                      :   "each location can have multiple",
     ""                      :   "zone-groups and/or zones",