diff --git a/config/ifupdown2.conf b/config/ifupdown2.conf
index d7680ce..96ea793 100644
--- a/config/ifupdown2.conf
+++ b/config/ifupdown2.conf
@@ -23,8 +23,8 @@ multiple_vlan_aware_bridge_support=0
 # cross marks against interface attributes.
 # Use the below strings to modify the default behaviour.
 #
-ifquery_check_success_str=(ok)
-ifquery_check_error_str=(fail)
+ifquery_check_success_str=[ok]
+ifquery_check_error_str=[fail]
 ifquery_check_unknown_str=
 #