diff --git a/autoload/fzf/vim/complete.vim b/autoload/fzf/vim/complete.vim
index 03c9b3b..8944b19 100644
--- a/autoload/fzf/vim/complete.vim
+++ b/autoload/fzf/vim/complete.vim
@@ -47,8 +47,9 @@ else
 endif
 
 function! fzf#vim#complete#word(...)
+  let sources = empty(&dictionary) ? ['/usr/share/dict/words'] : split(&dictionary, ',')
   return fzf#vim#complete(s:extend({
-    \ 'source': 'cat /usr/share/dict/words'},
+    \ 'source': 'cat ' . join(map(sources, 'shellescape(v:val)'))},
     \ get(a:000, 0, fzf#wrap())))
 endfunction