diff --git a/ops/nixos/swann/default.nix b/ops/nixos/swann/default.nix
index 160748e037..996a1399f6 100644
--- a/ops/nixos/swann/default.nix
+++ b/ops/nixos/swann/default.nix
@@ -49,7 +49,7 @@ in {
           { address = "2a02:88fd:f:d::2"; prefixLength = 64; }
         ];
         ipv6.routes = [
-          { address = "2a02:88fd:f:d::"; prefixLength = 64; options.metric = 100; }
+          { address = "2a02:88fd:f:d::"; prefixLength = 64; options.metric = "100"; }
         ];
       };
     };