diff --git a/nixos/modules/services/networking/mosquitto.nix b/nixos/modules/services/networking/mosquitto.nix
index 1137c61df9a0..468f58b56bb1 100644
--- a/nixos/modules/services/networking/mosquitto.nix
+++ b/nixos/modules/services/networking/mosquitto.nix
@@ -483,7 +483,7 @@ let
 
     listeners = mkOption {
       type = listOf listenerOptions;
-      default = {};
+      default = [];
       description = ''
         Listeners to configure on this broker.
       '';