diff --git a/modules/services/matrix-appservice-irc.nix b/modules/services/matrix-appservice-irc.nix
index 38bc167..95acf0a 100644
--- a/modules/services/matrix-appservice-irc.nix
+++ b/modules/services/matrix-appservice-irc.nix
@@ -90,6 +90,7 @@ in
             dynamicChannels = {
               enabled = true;
               useHomeserverDirectory = true;
+              joinRule = "invite";
               aliasTemplate = "#irc_\$\$CHANNEL";
             };