diff --git a/build-constraints.yaml b/build-constraints.yaml
index a63f1177..c023dd7a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5143,6 +5143,7 @@ packages:
         - agreeing
         - mappings
         - partialord
+        - radix-tree
         - tophat
 
     "Jan Synacek <jan.synacek@scrive.com> @jsynacek":