diff --git a/core/proc/shared/dup.rb b/core/proc/shared/dup.rb
index eda1d6929d..4480f3d0c9 100644
--- a/core/proc/shared/dup.rb
+++ b/core/proc/shared/dup.rb
@@ -7,4 +7,12 @@
 
     a.call.should == b.call
   end
+
+  ruby_version_is "3.2" do
+    it "returns an instance of subclass" do
+      cl = Class.new(Proc)
+
+      cl.new{}.send(@method).class.should == cl
+    end
+  end
 end