diff --git a/build-constraints.yaml b/build-constraints.yaml
index 869d10cb..f45104d5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4756,6 +4756,7 @@ packages:
 
     "Grandfathered dependencies":
         - Boolean
+        - Cabal-syntax
         - Decimal
         - Diff
         - FloatingHex