diff --git a/src/Postlude.hs b/src/Postlude.hs
index 9a459af..0c4aff6 100644
--- a/src/Postlude.hs
+++ b/src/Postlude.hs
@@ -122,6 +122,7 @@ import Data.List as X
   , foldl1
   , foldr
   , foldr1
+  , length
   , map
   , zip
   )