diff --git a/ops/nixos/lib/bgp.nix b/ops/nixos/lib/bgp.nix
index 4166e1515e..46ec0dded0 100644
--- a/ops/nixos/lib/bgp.nix
+++ b/ops/nixos/lib/bgp.nix
@@ -15,6 +15,7 @@ let
       if ! (avoid_martians4()) then reject;
       ${if ix.remote.must_be_next_hop then "if (bgp_path.first != ${toString ix.remote.asn}) then reject;" else "# no next-hop requirement"}
       ${lib.concatMapStringsSep "\n" (asn: "if (bgp_path ~ [= * ${toString asn} * =]) then reject;") ix.remote.drop_asns}
+      if (bgp_path ~ [= * 16276 * =] && gw = 195.66.225.6) then gw = 195.66.224.220;  # OVH must go via router 1; router 2 is bork.
       bgp_local_pref = ${toString ix.remote.bgp_local_pref};
       accept;
     }
@@ -25,6 +26,7 @@ let
       if ! (avoid_martians6()) then reject;
       ${if ix.remote.must_be_next_hop then "if (bgp_path.first != ${toString ix.remote.asn}) then reject;" else "# no next-hop requirement"}
       ${lib.concatMapStringsSep "\n" (asn: "if (bgp_path ~ [= * ${toString asn} * =]) then reject;") ix.remote.drop_asns}
+      if (bgp_path ~ [= * 16276 * =] && gw = 2001:7f8:4::3f94:2) then gw = 2001:7f8:4::3f94:1;  # OVH must go via router 1; router 2 is bork.
       bgp_local_pref = ${toString ix.remote.bgp_local_pref};
       accept;
     }