diff --git a/Text/LaTeX/Base/Render.hs b/Text/LaTeX/Base/Render.hs
index f1f9591..2c42ca3 100644
--- a/Text/LaTeX/Base/Render.hs
+++ b/Text/LaTeX/Base/Render.hs
@@ -22,10 +22,11 @@ module Text.LaTeX.Base.Render
  , showFloat
    ) where
 
-import Data.Text (Text,lines,unlines)
+import Data.Text (Text,lines,unlines,uncons)
 import Text.LaTeX.Base.Syntax
 import Text.LaTeX.Base.Class
 import Data.String
+import Data.Char (isAlpha)
 import Data.Text.Encoding
 import Data.List (intersperse)
 import qualified Data.ByteString as B