diff --git a/machines/hippocampus/servers/public/matrix/bots/discord.nix b/machines/hippocampus/servers/public/matrix/bots/discord.nix
index d4eff07..332f57f 100644
--- a/machines/hippocampus/servers/public/matrix/bots/discord.nix
+++ b/machines/hippocampus/servers/public/matrix/bots/discord.nix
@@ -173,9 +173,6 @@ in {
           # The bridge supports MSC3860 media download redirects and will use them if the requester supports it.
           # Optionally, you can force redirects and not allow proxying at all by setting this to false.
           allow_proxy = true;
-          # Matrix server signing key to make the federation tester pass, same format as synapse's .signing.key file.
-          # This key is also used to sign the mxc:// URIs to ensure only the bridge can generate them.
-          server_key = "$MAUTRIX_DISCORD_APPSERVICE_DIRECT_MEDIA";
         };
         # Settings for converting animated stickers.
         animated_sticker = {