diff --git a/pkgs/development/libraries/libtsm/default.nix b/pkgs/development/libraries/libtsm/default.nix
index 9ba25f33282..bac29bc0ca8 100644
--- a/pkgs/development/libraries/libtsm/default.nix
+++ b/pkgs/development/libraries/libtsm/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "01ygwrsxfii0pngfikgqsb4fxp8n1bbs47l7hck81h9b9bc1ah8i";
   };
 
-  buildInputs = [ libxkbcommon pkgconfig ] ++ stdenv.isDarwin [
+  buildInputs = [ libxkbcommon pkgconfig ] ++ lib.optionals stdenv.isDarwin [
     autoreconfHook
   ];