diff --git a/pkg/arvo/sys/zuse.hoon b/pkg/arvo/sys/zuse.hoon
index 7160a150a..2e5d1158b 100644
--- a/pkg/arvo/sys/zuse.hoon
+++ b/pkg/arvo/sys/zuse.hoon
@@ -5270,7 +5270,7 @@
   ::
   ++  run
     ~/  %run
-    |=  [a=(tree item) b=$-(val val)]
+    |=  [a=(tree item) b=$-(val *)]
     |-
     ?~  a  a
     [n=[key.n.a (b val.n.a)] l=$(a l.a) r=$(a r.a)]