diff --git a/pkgs/tools/misc/expect/default.nix b/pkgs/tools/misc/expect/default.nix
index 12e63686d51..718da8dca4a 100644
--- a/pkgs/tools/misc/expect/default.nix
+++ b/pkgs/tools/misc/expect/default.nix
@@ -33,6 +33,8 @@ stdenv.mkDerivation rec {
     done
   '';
 
+  outputs = [ "out" "dev" ];
+
   meta = with lib; {
     description = "A tool for automating interactive applications";
     homepage = "http://expect.sourceforge.net/";