diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4dc2bbb2..4e4f9b58 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2272,6 +2272,9 @@ packages:
 
         # https://github.com/fpco/stackage/issues/1449
         - bytestring-builder < 0.10.8.1.0
+
+        # https://github.com/fpco/stackage/issues/1451
+        - singletons < 2.1
 # end of packages