diff --git a/conf/nginx.conf b/conf/nginx.conf
index a5f3122..97d9d45 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -6,7 +6,10 @@ location __PATH__/ {
   proxy_http_version 1.1;
   proxy_set_header Upgrade $http_upgrade;
   proxy_set_header Connection upgrade;
-
+  
+  # Must be at least as large as the chunk size of PsiTransfer.
+  client_max_body_size 5M;
+  
   # Include SSOWAT user panel.
   include conf.d/yunohost_panel.conf.inc;
 }