diff --git a/pkgs/development/libraries/protobuf/generic.nix b/pkgs/development/libraries/protobuf/generic.nix
index 51136c31aa1..f67d877cda0 100644
--- a/pkgs/development/libraries/protobuf/generic.nix
+++ b/pkgs/development/libraries/protobuf/generic.nix
@@ -17,6 +17,8 @@ stdenv.mkDerivation rec {
       --replace 'tmpnam(b)' '"'$TMPDIR'/foo"'
   '';
 
+  outputs = [ "out" "lib" ];
+
   buildInputs = [ autoreconfHook zlib ];
 
   doCheck = true;