diff --git a/build-constraints.yaml b/build-constraints.yaml
index a961c32b..60001210 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -194,6 +194,7 @@ packages:
         - bake
         - ghcid
         - pugixml
+        - hexml
 
     "Alan Zimmerman @alanz":
         - hjsmin