diff --git a/lib/rdoc/ri/driver.rb b/lib/rdoc/ri/driver.rb
index 08c4d08f81e329..64783dc163781c 100644
--- a/lib/rdoc/ri/driver.rb
+++ b/lib/rdoc/ri/driver.rb
@@ -1088,7 +1088,7 @@ def interactive
 
     loop do
       name = if defined? Readline then
-               Readline.readline ">> "
+               Readline.readline ">> ", true
              else
                print ">> "
                $stdin.gets