diff --git a/modules/server/baba/collabora.nix b/modules/server/baba/collabora.nix
index 449c263..68c48f9 100644
--- a/modules/server/baba/collabora.nix
+++ b/modules/server/baba/collabora.nix
@@ -11,6 +11,7 @@
       };
 
       net = {
+        proto = "IPv4";
         listen = "loopback";
         post_allow.host = ["172.0.0.1"];
       };