1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/mail.nix b/nixos/modules/services/monitoring/prometheus/exporters/mail.nix
index 129c73eba4a..15079f5841f 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters/mail.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters/mail.nix
@@ -33,7 +33,7 @@ let
       '';
     };
     port = mkOption {
-      type = types.int;
+      type = types.port;
       example = 587;
       description = lib.mdDoc ''
         Port to use for SMTP.