diff --git a/lib/irb/command/measure.rb b/lib/irb/command/measure.rb
index f96be20de..47f9cf47f 100644
--- a/lib/irb/command/measure.rb
+++ b/lib/irb/command/measure.rb
@@ -35,13 +35,19 @@ def execute_internal(type = nil, arg = nil)
           end
         when :on
           added = IRB.set_measure_callback(arg)
-          puts "#{added[0]} is added." if added
+          display_added_message(added[0]) if added
         else
           added = IRB.set_measure_callback(type, arg)
-          puts "#{added[0]} is added." if added
+          display_added_message(added[0]) if added
         end
         nil
       end
+
+      private
+
+      def display_added_message(added)
+        puts "#{added} is added."
+      end
     end
   end