diff --git a/build-constraints.yaml b/build-constraints.yaml
index fffe9c2b..a78af672 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -614,6 +614,7 @@ packages:
         - ListTree
 
     "Marco Zocca @ocramz":
+        - ad-delcont
         - sparse-linear-algebra
         - depq
         - matrix-market-attoparsec