diff --git a/prototype/UI/index.html b/prototype/UI/index.html
index ffe06d93a..463b321d8 100644
--- a/prototype/UI/index.html
+++ b/prototype/UI/index.html
@@ -150,9 +150,7 @@
 
     // forall a b. Syntax a -> (a -> b) -> Syntax b
     Syntax.prototype.map = function(transform) {
-        if (this.indexed != null) { return new Syntax(this, transform); }
-        if (this.keyed != null) { return new Syntax(this, transform); }
-        if (this.leaf != null) { return new Syntax(this, transform); }
+        return new Syntax(this, transform);
     }
 
     function diffFromJSON(json) {