diff --git a/pkgs/development/libraries/libwnck/3.x.nix b/pkgs/development/libraries/libwnck/3.x.nix
index 6c6c0812c43..a763af96667 100644
--- a/pkgs/development/libraries/libwnck/3.x.nix
+++ b/pkgs/development/libraries/libwnck/3.x.nix
@@ -8,6 +8,9 @@ stdenv.mkDerivation {
     sha256 = "d48ac9c7f50c0d563097f63d07bcc83744c7d92a1b4ef65e5faeab32b5ccb723";
   };
 
+  outputs = [ "dev" "out" "docdev" ];
+  outputBin = "dev";
+
   patches = [ ./install_introspection_to_prefix.patch ];
 
   buildInputs = [ pkgconfig intltool ];
diff --git a/pkgs/development/libraries/libwnck/default.nix b/pkgs/development/libraries/libwnck/default.nix
index 6a4479bdda3..bb525812049 100644
--- a/pkgs/development/libraries/libwnck/default.nix
+++ b/pkgs/development/libraries/libwnck/default.nix
@@ -12,6 +12,9 @@ stdenv.mkDerivation rec {
     sha256 = "17isfjvrzgj5znld2a7zsk9vd39q9wnsysnw5jr8iz410z935xw3";
   };
 
+  outputs = [ "dev" "out" "docdev" ];
+  outputBin = "dev";
+
   buildInputs = [ pkgconfig gtk intltool xorg.libX11 xorg.libXres ];
   # ?another optional: startup-notification