gistfile1.diff

diff --git a/kernel/delta/module.rb b/kernel/delta/module.rb
index 2885d63..cdfe234 100644
--- a/kernel/delta/module.rb
+++ b/kernel/delta/module.rb
@@ -99,7 +99,7 @@ class Module
     while mod
 
       # Check for a cyclic include
-      if mod.equal? klass
+      if mod.equal?(klass) or (mod.kind_of?(Rubinius::IncludedModule) and mod.module.equal?(klass))
         raise ArgumentError, "cyclic include detected"
       end