diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index df36eb91..2363d428 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -789,8 +789,14 @@ in
       };
       "afws.m-labs.hk" = {
         enableACME = true;
-        locations."/".proxyPass = "http://localhost:3771";
-        locations."/".proxyWebsockets = true;
+        locations."/" = {
+          proxyPass = "http://localhost:3771";
+          proxyWebsockets = true;
+          extraConfig =
+            ''
+            proxy_read_timeout 2h;
+            '';
+        };
       };
       "git.m-labs.hk" = {
         forceSSL = true;