diff --git a/mastodon.nix b/mastodon.nix
index 536c05b..3be80d3 100644
--- a/mastodon.nix
+++ b/mastodon.nix
@@ -78,6 +78,15 @@ in {
     compression = "gzip";
   };
 
+  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
+    "elasticsearch"
+  ];
+
+  services.elasticsearch = {
+    enable = true;
+    package = pkgs.elasticsearch7;
+  };
+
   systemd.services.postgresqlBackup-mastodon.serviceConfig.ExecStartPost =
     pkgs.writeShellScript "backup-to-s3" ''
       cd /var/backup/postgresql
@@ -151,6 +160,8 @@ in {
       passwordFile = builtins.toFile "smtp-password" secrets.smtpPassword;
     };
 
+    elasticsearch.host = "localhost";
+
     vapidPublicKeyFile = builtins.toFile "vapidPublicKey" secrets.vapidPublicKey;
     secretKeyBaseFile = builtins.toFile "secretKeyBase" secrets.secretKeyBase;
     otpSecretFile = builtins.toFile "otpSecret" secrets.otpSecret;