diff --git a/nix/nixosModules/common/system-nixconf.nix b/nix/nixosModules/common/system-nixconf.nix
index fdfb8d20..cbce71b6 100644
--- a/nix/nixosModules/common/system-nixconf.nix
+++ b/nix/nixosModules/common/system-nixconf.nix
@@ -8,6 +8,10 @@
     package = lib.mkDefault pkgs.nix;
 
     settings = {
+      # it is impossible to anser in nix-direnv, so we force it to off.
+      # https://github.com/nix-community/nix-direnv/issues/678
+      accept-flake-config = lib.mkForce false;
+
       # Try to have at least 10GB of space by default
       min-free = lib.mkDefault (5 * 1024 * 1024 * 1024);
       max-free = lib.mkDefault (10 * 1024 * 1024 * 1024);