diff --git a/nixos/boxes/bolty/matrix-server.nix b/nixos/boxes/bolty/matrix-server.nix
index ba7a33d4..5caa2598 100644
--- a/nixos/boxes/bolty/matrix-server.nix
+++ b/nixos/boxes/bolty/matrix-server.nix
@@ -27,6 +27,7 @@
       }];
       experimental_features = { spaces_enabled = true; };
       enable_registration = false;
+      suppress_key_server_warning = true;
     };
     package =
       inputs.nixpkgs-nixos-unstable.legacyPackages."x86_64-linux".matrix-synapse;