diff --git a/runtime/ftplugin/haskell.vim b/runtime/ftplugin/haskell.vim
index 84f4d05..2a864bf 100644
--- a/runtime/ftplugin/haskell.vim
+++ b/runtime/ftplugin/haskell.vim
@@ -17,6 +17,7 @@
 setlocal comments=s1fl:{-,mb:-,ex:-},:-- commentstring=--\ %s
 setlocal formatoptions-=t formatoptions+=croql
 setlocal omnifunc=haskellcomplete#Complete
+setlocal iskeyword+='
 
 let &cpo = s:cpo_save
 unlet s:cpo_save