1 files changed, 9 insertions, 2 deletions
diff --git a/lib/set.rb b/lib/set.rb
index 0d9870ccd7..db57594d0a 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -100,11 +100,18 @@ class Set
   end
   private :do_with_enum
 
-  # Copy internal hash.
-  def initialize_copy(orig)
+  # Dup internal hash.
+  def initialize_dup(orig)
+    super
     @hash = orig.instance_variable_get(:@hash).dup
   end
 
+  # Clone internal hash.
+  def initialize_clone(orig)
+    super
+    @hash = orig.instance_variable_get(:@hash).clone
+  end
+
   def freeze    # :nodoc:
     @hash.freeze
     super