diff --git a/nixos/doc/manual/release-notes/rl-2505.section.md b/nixos/doc/manual/release-notes/rl-2505.section.md
index 0db6aded4ea9..d6f5fa97e0b1 100644
--- a/nixos/doc/manual/release-notes/rl-2505.section.md
+++ b/nixos/doc/manual/release-notes/rl-2505.section.md
@@ -95,6 +95,8 @@
 
 - Cinnamon has been updated to 6.4.
 
+- `services.avahi.ipv6` now defaults to true.
+
 - `bind.cacheNetworks` now only controls access for recursive queries, where it previously controlled access for all queries.
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
diff --git a/nixos/modules/services/networking/avahi-daemon.nix b/nixos/modules/services/networking/avahi-daemon.nix
index 73fc210728d8..47b707f213f0 100644
--- a/nixos/modules/services/networking/avahi-daemon.nix
+++ b/nixos/modules/services/networking/avahi-daemon.nix
@@ -91,7 +91,7 @@ in
 
     ipv6 = lib.mkOption {
       type = lib.types.bool;
-      default = false;
+      default = true;
       description = "Whether to use IPv6.";
     };