diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8601518b..9c9adef4 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2478,6 +2478,7 @@ packages:
         - aeson-casing
         - graylog
         - parsec-numeric
+        - mallard
 
     "Callum Rogers @CRogers":
         - should-not-typecheck