diff --git a/build-constraints.yaml b/build-constraints.yaml
index aeda1d34..a25cea72 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3187,6 +3187,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/3173
         - th-desugar < 1.8
+        - singletons < 2.4
 
 # end of packages