1 files changed, 4 insertions, 2 deletions
diff --git a/lib/expression/dune b/lib/expression/dune
index d141b7b..8bf6e62 100755
--- a/lib/expression/dune
+++ b/lib/expression/dune
@@ -7,6 +7,8 @@
    importErrors
  )
  (preprocess (pps 
-    ppx_deriving.show 
-    ppx_deriving.eq ))
+   ppx_deriving.ord
+   ppx_deriving.show 
+   ppx_deriving.eq 
+   ))
 )