diff --git a/src/MdToHTML.hs b/src/MdToHTML.hs
index 68afebb..0e86001 100644
--- a/src/MdToHTML.hs
+++ b/src/MdToHTML.hs
@@ -6,6 +6,7 @@ module MdToHTML where
 
 import Control.Applicative
 import Control.Monad
+import Data.Char
 import Data.List
 import Data.Ord (comparing)
 import Debug.Trace