diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4e4f9b58..a26f12f1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2275,6 +2275,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/1451
         - singletons < 2.1
+        - th-desugar < 1.6
 # end of packages