diff --git a/build-constraints.yaml b/build-constraints.yaml
index b30a7cd8..ab60d2b0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7830,6 +7830,7 @@ packages:
         - eliminators < 0.9.7
         - singletons-base < 3.5.1
         - singletons-th < 3.5.1
+        - th-desugar < 1.19
 
     "Stackage upper bounds":