diff --git a/build-constraints.yaml b/build-constraints.yaml
index f8ed013b..9f153894 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -38,9 +38,7 @@ packages:
         - hedgehog-quickcheck
         
     "Walter Schulze <awalterschulze@gmail.com> @awalterschulze":
-        []
-        # https://github.com/katydid/katydid-haskell/issues/7
-        # - katydid
+        - katydid
 
     "Nobutada Matsubara <t12307043@gunma-u.ac.jp> @matsubara0507":
         - chatwork