diff --git a/hosts/hainich/services/mattermost.nix b/hosts/hainich/services/mattermost.nix
index 9271836..68e2c14 100644
--- a/hosts/hainich/services/mattermost.nix
+++ b/hosts/hainich/services/mattermost.nix
@@ -204,6 +204,19 @@
     locations."/" = {
       proxyPass = "http://${config.containers.mattermost.localAddress}:3000";
       proxyWebsockets = true;
+      extraConfig = ''
+        proxy_set_header        Host $host;
+        proxy_set_header        X-Real-IP $remote_addr;
+        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header        X-Forwarded-Proto $scheme;
+        proxy_set_header        X-Forwarded-Host $host;
+        proxy_set_header        X-Forwarded-Server $host;
+
+        # Mattermost CSR Patch
+        proxy_hide_header Content-Security-Policy;
+        proxy_hide_header X-Frame-Options;
+        proxy_redirect off;
+      '';
     };
     forceSSL = true;
     enableACME = true;