diff --git a/implementations/javascript/packages/schema/src/compiler/genunconverter.ts b/implementations/javascript/packages/schema/src/compiler/genunconverter.ts
index 08afa01..a297090 100644
--- a/implementations/javascript/packages/schema/src/compiler/genunconverter.ts
+++ b/implementations/javascript/packages/schema/src/compiler/genunconverter.ts
@@ -53,10 +53,10 @@ function unconverterFor(ctx: FunctionContext, p: M.Pattern, src: string): Item {
                                    unconverterFor(ctx, M.Pattern.SimplePattern(p.pattern), 'v'),
                                    `)`);
                     case 'setof':
-                        return seq(`new _.Set<_embedded>`, parens(
+                        return seq(`new _.Set<_embedded>`, parens(seq(
                             `_.Array.from(${src}.values()).map(v => `,
                             unconverterFor(ctx, M.Pattern.SimplePattern(p.pattern), 'v'),
-                            `)`));
+                            `)`)));
                     case 'dictof':
                         return seq(`new _.Dictionary<_embedded>`, parens(seq(
                             `_.Array.from(${src}.entries()).map(([k, v]) => `,