diff --git a/pkgs/development/ruby-modules/bundled-common/default.nix b/pkgs/development/ruby-modules/bundled-common/default.nix
index cd2f6f379efc..3bb95521132b 100644
--- a/pkgs/development/ruby-modules/bundled-common/default.nix
+++ b/pkgs/development/ruby-modules/bundled-common/default.nix
@@ -23,6 +23,7 @@
 , nativeBuildInputs ? []
 , buildInputs ? []
 , extraConfigPaths ? []
+, passthru ? {}
 , ...
 }@args:
 
@@ -182,7 +183,7 @@ let
             exit 1
           '';
         };
-    });
+    } // passthru);
   };
 
   basicEnv =