diff --git a/modules/common.nix b/modules/common.nix
index be76f86..3943b8d 100644
--- a/modules/common.nix
+++ b/modules/common.nix
@@ -14,6 +14,7 @@
     ];
     connect-timeout = 5;
     stalled-download-timeout = 15;
+    flake-registry = "";  # disable global registry fetch (channels.nixos.org unreachable from CN)
   };
 
   environment.systemPackages = with pkgs; [