diff --git a/pkgs/development/libraries/libpsl/default.nix b/pkgs/development/libraries/libpsl/default.nix
index f4f6375cb419..a8fcd2581caa 100644
--- a/pkgs/development/libraries/libpsl/default.nix
+++ b/pkgs/development/libraries/libpsl/default.nix
@@ -23,6 +23,9 @@ stdenv.mkDerivation rec {
     hash = "sha256-mp9qjG7bplDPnqVUdc0XLdKEhzFoBOnHMgLZdXLNOi0=";
   };
 
+  # bin/psl-make-dafsa brings a large runtime closure through python3
+  outputs = [ "bin" "out" "dev" ];
+
   nativeBuildInputs = [
     autoreconfHook
     docbook_xsl
diff --git a/pkgs/servers/web-apps/discourse/default.nix b/pkgs/servers/web-apps/discourse/default.nix
index 320eac3bc8ce..e625e51f2a0b 100644
--- a/pkgs/servers/web-apps/discourse/default.nix
+++ b/pkgs/servers/web-apps/discourse/default.nix
@@ -188,7 +188,7 @@ let
             # available for aarch64. It has to be called
             # libpsl.x86_64.so or it isn't found.
             postPatch = ''
-              cp $(readlink -f ${libpsl}/lib/libpsl.so) vendor/libpsl.x86_64.so
+              cp $(readlink -f ${lib.getLib libpsl}/lib/libpsl.so) vendor/libpsl.x86_64.so
             '';
           };
         };