diff --git a/conf/nginx.conf b/conf/nginx.conf
index 86028ea..978c8e6 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -11,4 +11,6 @@ location /_matrix {
   proxy_read_timeout 600;
   client_max_body_size 100M;
   more_set_headers "Access-Control-Allow-Origin: *";
+
+  client_max_body_size 20M;
 }