diff --git a/prototype/UI/index.html b/prototype/UI/index.html
index e6891764f..fc609b462 100644
--- a/prototype/UI/index.html
+++ b/prototype/UI/index.html
@@ -152,7 +152,7 @@
     Syntax.prototype.map = function(transform) {
         if (this.leaf != null) { return new Syntax({ leaf: this.leaf }, transform); }
         if (this.indexed != null) { return new Syntax({ indexed: this.indexed }, transform); }
-        if (this.keyed != null) { return new Syntax({ keyed: this.keyed }, transform); }
+        if (this.keyed != null) { return new Syntax({ keyed: this.keyed.values }, transform); }
     }
 
     function diffFromJSON(json) {