diff --git a/pkgs/development/interpreters/joker/default.nix b/pkgs/development/interpreters/joker/default.nix
index a0302b5530d..8906c9c5d24 100644
--- a/pkgs/development/interpreters/joker/default.nix
+++ b/pkgs/development/interpreters/joker/default.nix
@@ -17,6 +17,8 @@ buildGoPackage rec {
 
   dontInstallSrc = true;
 
+  excludedPackages = "gen"; # Do not install private generators.
+
   goDeps = ./deps.nix;
 
   meta = with stdenv.lib; {