diff --git a/nixos/modules/i18n/input-method/fcitx5.nix b/nixos/modules/i18n/input-method/fcitx5.nix
index 2e87705c6dc2..ee8d2652b1c7 100644
--- a/nixos/modules/i18n/input-method/fcitx5.nix
+++ b/nixos/modules/i18n/input-method/fcitx5.nix
@@ -32,7 +32,8 @@ in
       };
       plasma6Support = mkOption {
         type = types.bool;
-        default = false;
+        default = config.services.xserver.desktopManager.plasma6.enable;
+        defaultText = literalExpression "config.services.xserver.desktopManager.plasma6.enable";
         description = lib.mdDoc ''
           Use qt6 versions of fcitx5 packages.
           Required for configuring fcitx5 in KDE System Settings.