diff --git a/peering.nix b/peering.nix
index 8549400..97cf12d 100644
--- a/peering.nix
+++ b/peering.nix
@@ -133,8 +133,8 @@ in
       };
     };
 
-    services.openssh.knownHosts = builtins.mapAttrs
-      (name: host: {
+    services.openssh.knownHosts = lib.mapAttrs'
+      (name: host: lib.nameValuePair ("birdsong_" + name) {
         publicKey = host.hostKey;
         hostNames = [ host.ipv4 host.ipv6 ];
       })