diff --git a/pkgs/tools/text/unrtf/default.nix b/pkgs/tools/text/unrtf/default.nix
index 6b177b8b37be..c2b845064d91 100644
--- a/pkgs/tools/text/unrtf/default.nix
+++ b/pkgs/tools/text/unrtf/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "1pcdzf2h1prn393dkvg93v80vh38q0v817xnbwrlwxbdz4k7i8r2";
   };
 
-  buildInputs = [ autoconf automake ];
+  nativeBuildInputs = [ autoconf automake ];
 
   preConfigure = "./bootstrap";