diff --git a/ChangeLog b/ChangeLog
index e39631a82c..0860584e9a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Aug 13 11:54:41 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* lib/irb/completion.rb: reverted r47163.
+	  because another case can't be show completion target.
+
 Wed Aug 13 11:17:00 2014  Shimpei Makimoto  <github@makimoto.org>
 
 	* lib/irb.rb: Prevent irb from crashing when exception with
diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index daaeb16b47..05b1ed4873 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -222,7 +222,7 @@ module IRB
 end
 
 if Readline.respond_to?("basic_word_break_characters=")
-  Readline.basic_word_break_characters= "\t\n\\`><=;|&{("
+  Readline.basic_word_break_characters= " \t\n`><=;|&{("
 end
 Readline.completion_append_character = nil
 Readline.completion_proc = IRB::InputCompletor::CompletionProc