diff --git a/modules/services/bin.nix b/modules/services/bin.nix
index 5b06108..5c4850e 100644
--- a/modules/services/bin.nix
+++ b/modules/services/bin.nix
@@ -71,7 +71,7 @@ in
       vHosts.${fqdn}.locations."/" = {
         proxyPort = cfg.port;
         extraConfig = ''
-          client_max_body_size ${settings.max_size / MiB}m;
+          client_max_body_size ${toString (settings.max_size / MiB)}m;
           proxy_send_timeout   300;
           proxy_read_timeout   300;
           send_timeout         300;