diff --git a/build-constraints.yaml b/build-constraints.yaml
index 440f9a84..1ba4c52d 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -826,6 +826,7 @@ packages:
         - HUnit
         - aeson
         - attoparsec-iso8601
+        - fay
         - feed
         - time-compat
         - through-text