diff --git a/data/filedefs/filetypes.haskell b/data/filedefs/filetypes.haskell
index d8f74c299d..953d419156 100644
--- a/data/filedefs/filetypes.haskell
+++ b/data/filedefs/filetypes.haskell
@@ -51,7 +51,7 @@ mime_type=text/x-haskell
 #wordchars=_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
 
 # single comments, like # in this file
-comment_single=--
+comment_single=--\s
 # multiline comments
 comment_open={-
 comment_close=-}