diff --git a/resources/chaosknoten/pretalx/nginx/pretalx.hamburg.ccc.de.conf b/resources/chaosknoten/pretalx/nginx/pretalx.hamburg.ccc.de.conf
index 10c4bf7..f12067a 100644
--- a/resources/chaosknoten/pretalx/nginx/pretalx.hamburg.ccc.de.conf
+++ b/resources/chaosknoten/pretalx/nginx/pretalx.hamburg.ccc.de.conf
@@ -22,6 +22,8 @@ server {
     # HSTS (ngx_http_headers_module is required) (63072000 seconds)
     add_header Strict-Transport-Security "max-age=63072000" always;
 
+    client_max_body_size 50M;
+
     proxy_set_header Host $host;
     proxy_set_header X-Forwarded-Host $host;
     proxy_set_header X-Real-IP $remote_addr;