diff --git a/conf/options/charon.opt b/conf/options/charon.opt
index dc525a807..5d64d1f93 100644
--- a/conf/options/charon.opt
+++ b/conf/options/charon.opt
@@ -392,7 +392,7 @@ charon.retransmit_jitter = 0
 charon.retransmit_limit = 0
 	Upper limit in seconds for calculated retransmission timeout (0 to disable).
 
-charon.retry_initiate_interval = 0
+charon.retry_initiate_interval = 0s
 	Interval in seconds to use when retrying to initiate an IKE_SA (e.g. if DNS
 	resolution failed), 0 to disable retries.
 
diff --git a/conf/plugins/eap-radius.opt b/conf/plugins/eap-radius.opt
index 192996c73..dfed78165 100644
--- a/conf/plugins/eap-radius.opt
+++ b/conf/plugins/eap-radius.opt
@@ -5,7 +5,7 @@ charon.plugins.eap-radius.accounting_close_on_timeout = yes
 	Close the IKE_SA if there is a timeout during interim RADIUS accounting
 	updates.
 
-charon.plugins.eap-radius.accounting_interval = 0
+charon.plugins.eap-radius.accounting_interval = 0s
 	Interval in seconds for interim RADIUS accounting updates, if not specified
 	by the RADIUS server in the Access-Accept message.