diff --git a/pkgs/kde/gear/ktnef/default.nix b/pkgs/kde/gear/ktnef/default.nix
index 81bd5c70b616..9d4f0c51afd3 100644
--- a/pkgs/kde/gear/ktnef/default.nix
+++ b/pkgs/kde/gear/ktnef/default.nix
@@ -1,4 +1,9 @@
-{ mkKdeDerivation }:
+{
+  mkKdeDerivation,
+  kcalutils,
+}:
 mkKdeDerivation {
   pname = "ktnef";
+
+  extraBuildInputs = [ kcalutils ];
 }