diff --git a/build-constraints.yaml b/build-constraints.yaml
index 297ad7e2..d468e5fb 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6780,6 +6780,9 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/6273
       - freckle-app < 1.0.1
 
+      # https://github.com/commercialhaskell/stackage/issues/6278
+      - ad < 4.5
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of