diff --git a/nixos/modules/services/security/shibboleth-sp.nix b/nixos/modules/services/security/shibboleth-sp.nix
index e9f92dcc0928..74dd333b1ae7 100644
--- a/nixos/modules/services/security/shibboleth-sp.nix
+++ b/nixos/modules/services/security/shibboleth-sp.nix
@@ -30,13 +30,13 @@ in
       };
 
       fastcgi.shibAuthorizerPort = lib.mkOption {
-        type = lib.types.int;
+        type = lib.types.port;
         default = 9100;
         description = "Port for shibauthorizer FastCGI process to bind to";
       };
 
       fastcgi.shibResponderPort = lib.mkOption {
-        type = lib.types.int;
+        type = lib.types.port;
         default = 9101;
         description = "Port for shibauthorizer FastCGI process to bind to";
       };