diff --git a/files/swanctl-wit.conf.wit b/files/swanctl-wit.conf.wit
index 21c8032..51903e7 100644
--- a/files/swanctl-wit.conf.wit
+++ b/files/swanctl-wit.conf.wit
@@ -17,6 +17,7 @@ connections {
 
         children {
             loopback4 {
+                interface = lo,feth+
                 remote_ts = IPSEC_IPV4_SUBNETS
                 local_ts = LOOPBACKv4
                 mode = transport
@@ -44,6 +45,7 @@ connections {
 
         children {
             loopback6 {
+                interface = lo,feth+
                 remote_ts = IPSEC_IPV6_SUBNETS
                 local_ts = LOOPBACKv6
                 mode = transport