diff --git a/koans/path_to_enlightenment.rb b/koans/path_to_enlightenment.rb
index f8b09c7..641559a 100644
--- a/koans/path_to_enlightenment.rb
+++ b/koans/path_to_enlightenment.rb
@@ -31,4 +31,7 @@ require 'about_scope'
 require 'about_class_methods'
 require 'about_message_passing'
 require 'about_proxy_object_project'
+in_ruby_version("jruby") do
+  require 'about_java_interop'
+end
 require 'about_extra_credit'
diff --git a/src/path_to_enlightenment.rb b/src/path_to_enlightenment.rb
index f8b09c7..641559a 100644
--- a/src/path_to_enlightenment.rb
+++ b/src/path_to_enlightenment.rb
@@ -31,4 +31,7 @@ require 'about_scope'
 require 'about_class_methods'
 require 'about_message_passing'
 require 'about_proxy_object_project'
+in_ruby_version("jruby") do
+  require 'about_java_interop'
+end
 require 'about_extra_credit'