diff --git a/hosts/pretalx/default.nix b/hosts/pretalx/default.nix
index c97fef09..30c2446b 100644
--- a/hosts/pretalx/default.nix
+++ b/hosts/pretalx/default.nix
@@ -12,6 +12,9 @@
 
     nginx = {
       enable = true;
+      commonHttpConfig = /* nginx */ ''
+        proxy_headers_hash_bucket_size 64;
+      '';
       virtualHosts."talks.datenspuren.de" = {
         default = true;
         forceSSL = true;