diff --git a/src/java/com/threerings/presents/tools/dobject_set.tmpl b/src/java/com/threerings/presents/tools/dobject_set.tmpl
index b8dfc6bf2..6b6200945 100644
--- a/src/java/com/threerings/presents/tools/dobject_set.tmpl
+++ b/src/java/com/threerings/presents/tools/dobject_set.tmpl
@@ -41,5 +41,7 @@
     public void set$upfield ($type value)
     {
         requestAttributeChange($capfield, value, this.$field);
-        this.$field = $clonefield;
+        @SuppressWarnings("unchecked") $type clone =
+            $clonefield;
+        this.$field = clone;
     }