diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 55e25d3..1c67661 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -30,6 +30,8 @@ rec {
 
     buildInputs = (oldAttrs.buildInputs or []) ++ ligatureInputs;
 
+    outputs = [ "out" ];
+
     # HACK: One of the ligature libraries required the C++ stdlib at runtime,
     # and I can't work out a better way to push it to the RPATH.
     postInstall = pkgs.lib.optional (!pkgs.stdenv.isDarwin) ''