diff --git a/fediversity/mastodon.nix b/fediversity/mastodon.nix
index 14568a7..7c465fe 100644
--- a/fediversity/mastodon.nix
+++ b/fediversity/mastodon.nix
@@ -57,8 +57,8 @@ lib.mkIf (config.fediversity.enable && config.fediversity.mastodon.enable) {
 
   #### mastodon setup
 
-  # open up access to the mastodon web interface
-  networking.firewall.allowedTCPPorts = [ 443 ];
+  # open up access to the mastodon web interface. 80 is necessary if only for ACME
+  networking.firewall.allowedTCPPorts = [ 80 443 ];
 
   services.mastodon = {
     enable = true;