diff --git a/build-constraints.yaml b/build-constraints.yaml
index 38471007..79a8252f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -517,7 +517,7 @@ packages:
     "Chris Allen <cma@bitemyapp.com> bitemyapp":
         - machines-directory
         - machines-io
-        # - bloodhound # BLOCKED derive and aeson-1.0
+        - bloodhound
 
     "Adam Bergmark <adam@bergmark.nl> @bergmark":
         - HUnit