diff --git a/nixos/modules/services/monitoring/prometheus/exporters/smartctl.nix b/nixos/modules/services/monitoring/prometheus/exporters/smartctl.nix
index 0c5648c14149..f80aeae9c6b7 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters/smartctl.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters/smartctl.nix
@@ -9,7 +9,7 @@ let
     "--smartctl.path=\"${pkgs.smartmontools}/bin/smartctl\" "
     "--smartctl.interval=\"${cfg.maxInterval}\" "
     "${concatMapStringsSep " " (device: "--smartctl.device=${device}") cfg.devices}"
-  ];
+  ] ++ cfg.extraFlags;
 in {
   port = 9633;