diff --git a/nixos/modules/services/misc/docker-registry.nix b/nixos/modules/services/misc/docker-registry.nix
index 1c2e2cc53590..e212f581c28a 100644
--- a/nixos/modules/services/misc/docker-registry.nix
+++ b/nixos/modules/services/misc/docker-registry.nix
@@ -58,7 +58,7 @@ in {
     port = mkOption {
       description = "Docker registry port to bind to.";
       default = 5000;
-      type = types.int;
+      type = types.port;
     };
 
     storagePath = mkOption {