diff --git a/autoload/neosnippet/parser.vim b/autoload/neosnippet/parser.vim
index 3824235..6813c8a 100644
--- a/autoload/neosnippet/parser.vim
+++ b/autoload/neosnippet/parser.vim
@@ -416,7 +416,7 @@ endfunction
 function! neosnippet#parser#_conceal_argument(arg, cnt, args) abort
   let outside = ''
   let inside = ''
-  if (a:args != '')
+  if a:args != ''
     if g:neosnippet#enable_optional_arguments
       let inside = ', '
     else