diff --git a/build-constraints.yaml b/build-constraints.yaml
index e54d1832..095a0b44 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3393,7 +3393,7 @@ packages:
 
     "Kadzuya Okamoto <arow.okamoto@gmail.com> @arowM":
         - type-level-kv-list
-        - heterocephalus < 0 # #5434/closed
+        - heterocephalus
         - bookkeeping < 0 # GHC 8.4 BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - ochintin-daicho < 0 # GHC 8.4 DependencyFailed (PackageName "bookkeeping")
         - transaction