diff --git a/flake.nix b/flake.nix
index 1688264..cd4c73e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -65,6 +65,12 @@ Some utility commands:
               The ji-chan package that should be used.
             '';
           };
+          user = lib.mkOption {
+            type = lib.types.str;
+            description = lib.mdDoc ''
+              User account under which ji-chan runs.
+            '';
+          };
           domain = lib.mkOption {
             type = lib.types.str;
             default = "tegakituesday.com";
@@ -107,8 +113,7 @@ Some utility commands:
           wantedBy = [ "network.target" ];
           serviceConfig = {
             ExecStart = ''
-              ${cfg.package}/bin/ji-chan --domain ${cfg.domain} --token ${cfg.token} --prefix "${builtins.replaceStrings ["\""] ["\\\""] cfg.prefix}" --hugo ${cfg.hugo} --guilds ${cfg.guildData}
-            '';
+              ${ if (cfg.user != null) then "User=${cfg.user}\n" else "" }${cfg.package}/bin/ji-chan --domain ${cfg.domain} --token ${cfg.token} --prefix "${builtins.replaceStrings ["\""] ["\\\""] cfg.prefix}" --hugo ${cfg.hugo} --guilds ${cfg.guildData}'';
             Restart = "always";
             DynamicUser = true;
           };