diff --git a/ftdetect/purescript.vim b/ftdetect/purescript.vim
index fd374f7..e9a9efd 100644
--- a/ftdetect/purescript.vim
+++ b/ftdetect/purescript.vim
@@ -1,2 +1 @@
 au BufNewFile,BufRead *.purs setf purescript
-au FileType purescript let &l:commentstring='{--%s--}'
diff --git a/ftplugin/purescript.vim b/ftplugin/purescript.vim
index f11f4ee..be2760a 100644
--- a/ftplugin/purescript.vim
+++ b/ftplugin/purescript.vim
@@ -1,4 +1,5 @@
 setlocal comments=s1fl:{-,mb:\ \ ,ex:-},:--\ \|,:--
+setlocal commentstring=--\ %s
 setlocal include=^import
 setlocal includeexpr=printf('%s.purs',substitute(v:fname,'\\.','/','g'))