diff --git a/nixos/modules/services/web-apps/mattermost.nix b/nixos/modules/services/web-apps/mattermost.nix
index be74a2b1955b..277cbe35b78f 100644
--- a/nixos/modules/services/web-apps/mattermost.nix
+++ b/nixos/modules/services/web-apps/mattermost.nix
@@ -203,11 +203,11 @@ in
           Group = cfg.group;
           ExecStart = "${pkgs.mattermost}/bin/mattermost-platform";
           WorkingDirectory = "${cfg.statePath}";
-          JoinsNamespaceOf = mkIf cfg.localDatabaseCreate "postgresql.service";
           Restart = "always";
           RestartSec = "10";
           LimitNOFILE = "49152";
         };
+        unitConfig.JoinsNamespaceOf = mkIf cfg.localDatabaseCreate "postgresql.service";
       };
     })
     (mkIf cfg.matterircd.enable {