diff --git a/src/Text/Pandoc/Readers/Org/DocumentTree.hs b/src/Text/Pandoc/Readers/Org/DocumentTree.hs
index 9730854c0..f77778ec9 100644
--- a/src/Text/Pandoc/Readers/Org/DocumentTree.hs
+++ b/src/Text/Pandoc/Readers/Org/DocumentTree.hs
@@ -36,7 +36,7 @@ import Control.Arrow ((***))
 import Control.Monad (guard, void)
 import Data.Char (toLower, toUpper)
 import Data.List (intersperse)
-import Data.Monoid ((<>), mconcat)
+import Data.Monoid ((<>))
 import Text.Pandoc.Builder (Blocks, Inlines)
 import Text.Pandoc.Class (PandocMonad)
 import Text.Pandoc.Definition