diff --git a/plugin/functions.vim b/plugin/functions.vim
index b8704dc..c7fec97 100644
--- a/plugin/functions.vim
+++ b/plugin/functions.vim
@@ -86,9 +86,9 @@ command! -nargs=+ Silent execute 'silent <args>' | redraw!
 
 " Set the tab width for the current filetype
 function! <SID>TabWidth(width)
-  execute "set tabstop=".a:width
-  execute "set shiftwidth=".a:width
-  execute "set softtabstop=".a:width
+  execute "setlocal tabstop=".a:width
+  execute "setlocal shiftwidth=".a:width
+  execute "setlocal softtabstop=".a:width
   echo "Tab width is now ".a:width
 endfunction
 command! -nargs=1 TabWidth :call <SID>TabWidth(<f-args>)