diff --git a/pkgs/development/libraries/spandsp/default.nix b/pkgs/development/libraries/spandsp/default.nix
index c2dc20cc392..da73e5ab931 100644
--- a/pkgs/development/libraries/spandsp/default.nix
+++ b/pkgs/development/libraries/spandsp/default.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
     url = "https://www.soft-switch.org/downloads/spandsp/spandsp-${version}.tar.gz";
     sha256 = "0rclrkyspzk575v8fslzjpgp4y2s4x7xk3r55ycvpi4agv33l1fc";
   };
-  buildInputs = [];
+  outputs = [ "out" "dev" ];
   propagatedBuildInputs = [audiofile libtiff];
   meta = {
     homepage = http://www.creytiv.com/baresip.html;
@@ -18,4 +18,3 @@ stdenv.mkDerivation rec {
     updateWalker = true;
   };
 }
-