diff --git a/lib/hashie/mash.rb b/lib/hashie/mash.rb
index 5456bb3e..4d25b3b9 100644
--- a/lib/hashie/mash.rb
+++ b/lib/hashie/mash.rb
@@ -77,10 +77,6 @@ def type #:nodoc:
       self["type"]
     end
 
-    def object_id #:nodoc:
-      self["object_id"]
-    end
-
     alias_method :regular_reader, :[]
     alias_method :regular_writer, :[]=
 
diff --git a/spec/hashie/mash_spec.rb b/spec/hashie/mash_spec.rb
index 71f398d2..6cd3994a 100644
--- a/spec/hashie/mash_spec.rb
+++ b/spec/hashie/mash_spec.rb
@@ -97,15 +97,6 @@
     @mash.author.should be_nil
   end
 
-  it "should not call super if object_id is not a key" do
-    @mash.object_id.should == nil
-  end
-
-  it "should return the value if object_id is a key" do
-    @mash.object_id = "Steve"
-    @mash.object_id.should == "Steve"
-  end
-
   it "should not call super if id is not a key" do
     @mash.id.should == nil
   end