diff --git a/build-constraints.yaml b/build-constraints.yaml
index bd71935d..f67fd5b6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1788,6 +1788,9 @@ packages:
 
         # https://github.com/fpco/stackage/issues/1042
         - clock < 0.6
+
+        # https://github.com/fpco/stackage/issues/1047
+        - unbound-generics < 0.3
 # end of packages