diff --git a/flake.nix b/flake.nix
index 0ae62116..3969424d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -34,7 +34,7 @@
           mkdir autoload
           ln -s --relative "$autoload_target" autoload
           cat <<EOF >> kakrc
-          set-option global ui_options terminal_assistant=cat
+          set-option -add global ui_options terminal_assistant=cat
           EOF
         '';
       };