diff --git a/ops/nixos/swann/default.nix b/ops/nixos/swann/default.nix
index 69ada4e19b..9a4300869b 100644
--- a/ops/nixos/swann/default.nix
+++ b/ops/nixos/swann/default.nix
@@ -528,10 +528,12 @@ in {
         route ::/0 via 2a09:a442::1:2 bfd {
           # Virgin Media
           preference = 100;
+          krt_prefsrc = 2a09:a443::1;
         };
         route ::/0 via 2a09:a442::2:2 bfd {
           # EE
           preference = 10;
+          krt_prefsrc = 2a09:a443::1;
         };
 
         # Covering route...