diff --git a/hosts/porter/configuration.nix b/hosts/porter/configuration.nix
index 4e6acea..cc54a07 100644
--- a/hosts/porter/configuration.nix
+++ b/hosts/porter/configuration.nix
@@ -81,7 +81,7 @@
     ipv6 {
       table ospf6;
       export filter {
-        krt_prefsrc=fd00:152:152:102::1;
+        krt_prefsrc=${ (lib.head config.networking.interfaces.lo.ipv6.addresses).address };
         accept;
       };
       import none;
@@ -92,7 +92,7 @@
     ipv4 {
       table ospf4;
       export filter {
-        krt_prefsrc=10.152.102.1;
+        krt_prefsrc=${ (lib.head config.networking.interfaces.lo.ipv4.addresses).address };
         accept;
       };
       import none;