diff --git a/build-constraints.yaml b/build-constraints.yaml
index fbe580fc..00170861 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5140,6 +5140,7 @@ packages:
         - agreeing
         - mappings
         - partialord
+        - radix-tree
         - tophat
 
     "Jan Synacek <jan.synacek@scrive.com> @jsynacek":