diff --git a/nixos/modules/services/networking/syncthing.nix b/nixos/modules/services/networking/syncthing.nix
index 19c8ce15dfec..aa4d08a7f74a 100644
--- a/nixos/modules/services/networking/syncthing.nix
+++ b/nixos/modules/services/networking/syncthing.nix
@@ -336,7 +336,7 @@ in
                     };
 
                     localAnnouncePort = mkOption {
-                      type = types.nullOr types.int;
+                      type = types.nullOr types.port;
                       default = null;
                       description = ''
                         The port on which to listen and send IPv4 broadcast announcements to.