diff --git a/lib/irb/init.rb b/lib/irb/init.rb
index b306fbdd51..9fd86e94a2 100644
--- a/lib/irb/init.rb
+++ b/lib/irb/init.rb
@@ -65,6 +65,12 @@ module IRB
 	:RETURN => "%s\n"
       },
       :DEFAULT => {
+	:PROMPT_I => "%N(%m):%03n:%i> ",
+	:PROMPT_S => "%N(%m):%03n:%i%l ",
+	:PROMPT_C => "%N(%m):%03n:%i* ",
+	:RETURN => "=> %s\n"
+      },
+      :CLASSIC => {
 	:PROMPT_I => "%N(%m):%03n:%i> ",
 	:PROMPT_S => "%N(%m):%03n:%i%l ",
 	:PROMPT_C => "%N(%m):%03n:%i* ",