diff --git a/semantic-diff.cabal b/semantic-diff.cabal
index 21e408a7e..d7d5d5eeb 100644
--- a/semantic-diff.cabal
+++ b/semantic-diff.cabal
@@ -18,6 +18,7 @@ library
                      , Category
                      , Control.Comonad.Cofree
                      , Control.Monad.Free
+                     , Data.Copointed
                      , Data.Functor.Both
                      , Data.Option
                      , Data.OrderedMap
diff --git a/src/Data/Copointed.hs b/src/Data/Copointed.hs
new file mode 100644
index 000000000..19150bfe4
--- /dev/null
+++ b/src/Data/Copointed.hs
@@ -0,0 +1 @@
+module Data.Copointed where