diff --git a/modules/services/matrix-appservice-irc.nix b/modules/services/matrix-appservice-irc.nix
index 5c70b30..349bfa9 100644
--- a/modules/services/matrix-appservice-irc.nix
+++ b/modules/services/matrix-appservice-irc.nix
@@ -40,6 +40,8 @@ in
     enable = true;
 
     registrationUrl = "http://localhost:9999";
+    port = 9999;
+
     settings = {
       homeserver = {
         url = "https://matrix.crans.org:443";