diff --git a/nixos/modules/services/networking/git-daemon.nix b/nixos/modules/services/networking/git-daemon.nix
index 52c895215fbe..98f80dd4bc40 100644
--- a/nixos/modules/services/networking/git-daemon.nix
+++ b/nixos/modules/services/networking/git-daemon.nix
@@ -74,7 +74,7 @@ in
       };
 
       port = mkOption {
-        type = types.int;
+        type = types.port;
         default = 9418;
         description = "Port to listen on.";
       };