diff --git a/build-constraints.yaml b/build-constraints.yaml
index 04590e49..335e87ae 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1087,7 +1087,7 @@ packages:
        - dataurl
        - psql-helpers
        - superbuffer
-       - timespan
+       # - timespan # build failure GHC 8.4 https://github.com/agrafix/timespan/issues/1
        - distance
        - async-extra
        - format-numbers