diff --git a/nixos/modules/i18n/input-method/ibus.nix b/nixos/modules/i18n/input-method/ibus.nix
index 3eaf9e2ab37..a5bbe6bcb55 100644
--- a/nixos/modules/i18n/input-method/ibus.nix
+++ b/nixos/modules/i18n/input-method/ibus.nix
@@ -44,7 +44,7 @@ in
       panel = mkOption {
         type = with types; nullOr path;
         default = null;
-        example = literalExample "${pkgs.kde5.plasma-desktop}/lib/libexec/kimpanel-ibus-panel";
+        example = literalExample "''${pkgs.kde5.plasma-desktop}/lib/libexec/kimpanel-ibus-panel";
         description = "Replace the IBus panel with another panel.";
       };
     };