diff --git a/autoload/unite/sources/vimshell_external_history.vim b/autoload/unite/sources/vimshell_external_history.vim
index e417f3d6..72f0df2c 100644
--- a/autoload/unite/sources/vimshell_external_history.vim
+++ b/autoload/unite/sources/vimshell_external_history.vim
@@ -1,7 +1,7 @@
 "=============================================================================
 " FILE: vimshell_external_history.vim
 " AUTHOR:  Shougo Matsushita <Shougo.Matsu@gmail.com>
-" Last Modified: 13 Jul 2013.
+" Last Modified: 17 Feb 2014.
 " License: MIT license  {{{
 "     Permission is hereby granted, free of charge, to any person obtaining
 "     a copy of this software and associated documentation files (the
@@ -26,8 +26,8 @@
 
 " Variables  "{{{
 call unite#util#set_default('g:unite_source_vimshell_external_history_path',
-      \ fnamemodify($SHELL, ':t') ==# 'zsh' ? expand('~/.zsh-history') :
-      \ fnamemodify($SHELL, ':t') ==# 'bash' ? expand('~/.bash_history') :
+      \ fnamemodify(&shell, ':t') ==# 'zsh' ? expand('~/.zsh-history') :
+      \ fnamemodify(&shell, ':t') ==# 'bash' ? expand('~/.bash_history') :
       \ expand('~/.history')
       \)
 "}}}
diff --git a/doc/vimshell.txt b/doc/vimshell.txt
index 4ee4d1ce..b7d4a249 100644
--- a/doc/vimshell.txt
+++ b/doc/vimshell.txt
@@ -507,7 +507,7 @@ g:unite_source_vimshell_external_history_path
 		It is assignment of a history file that
 		|vimshell/external_history| source recognizes.
 
-		Default value is set to suit for $SHELL value.
+		Default value is set to suit for 'shell' value.
 
 ------------------------------------------------------------------------------
 KEY MAPPINGS 					*vimshell-key-mappings*