diff --git a/conf.d/opticswiki.conf b/conf.d/opticswiki.conf
index a8ea359..3f0b8c5 100644
--- a/conf.d/opticswiki.conf
+++ b/conf.d/opticswiki.conf
@@ -2,12 +2,14 @@
 
 server {
     listen 80;
+    client_max_body_size 20M;
     server_name opticswiki.psi.ch;
     return 301 https://$host$request_uri;
 }
 
 server {
     listen 443 ssl;
+    client_max_body_size 20M;
     server_name opticswiki.psi.ch;
 
     ssl_certificate /etc/nginx/certs/opticswiki.psi.ch.crt;