diff --git a/build-constraints.yaml b/build-constraints.yaml
index bdc6c6ef..8201ae50 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5102,6 +5102,7 @@ packages:
 
     "James Cranch <cranch@cantab.net> @jcranch":
         - agreeing
+        - mappings
         - partialord
         - tophat