diff --git a/nixos/modules/services/monitoring/prometheus/exporters.nix b/nixos/modules/services/monitoring/prometheus/exporters.nix
index 940f28189371..e48090d92bf8 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters.nix
@@ -64,7 +64,7 @@ let
   mkExporterOpts = ({ name, port }: {
     enable = mkEnableOption "the prometheus ${name} exporter";
     port = mkOption {
-      type = types.int;
+      type = types.port;
       default = port;
       description = ''
         Port to listen on.