diff --git a/pkgs/tools/typesetting/pdftk/default.nix b/pkgs/tools/typesetting/pdftk/default.nix
index 11baa176b88d..71cc1738837c 100644
--- a/pkgs/tools/typesetting/pdftk/default.nix
+++ b/pkgs/tools/typesetting/pdftk/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
     sha256 = "1hdq6zm2dx2f9h7bjrp6a1hfa1ywgkwydp14i2sszjiszljnm3qi";
   };
 
-  buildInputs = [ gcj unzip ];
+  nativeBuildInputs = [ gcj unzip ];
 
   hardeningDisable = [ "fortify" "format" ];