diff --git a/nixos/modules/services/games/terraria.nix b/nixos/modules/services/games/terraria.nix
index 9e8e5ae8759a..7312c7e6b635 100644
--- a/nixos/modules/services/games/terraria.nix
+++ b/nixos/modules/services/games/terraria.nix
@@ -42,7 +42,7 @@ in
       };
 
       port = mkOption {
-        type        = types.int;
+        type        = types.port;
         default     = 7777;
         description = ''
           Specifies the port to listen on.
@@ -50,7 +50,7 @@ in
       };
 
       maxPlayers = mkOption {
-        type        = types.int;
+        type        = types.ints.u8;
         default     = 255;
         description = ''
           Sets the max number of players (between 1 and 255).