diff --git a/implementations/javascript/packages/schema-cli/src/bin/preserves-schemac.ts b/implementations/javascript/packages/schema-cli/src/bin/preserves-schemac.ts
index ca620c3..dddc120 100644
--- a/implementations/javascript/packages/schema-cli/src/bin/preserves-schemac.ts
+++ b/implementations/javascript/packages/schema-cli/src/bin/preserves-schemac.ts
@@ -24,10 +24,9 @@ export function run(options: CommandLineArguments): void {
 
     if (failures.length === 0) {
         if (options.bundle) {
-            fs.writeSync(1, underlying(canonicalEncode(M.fromBundle({
-                modules: new KeyedDictionary<M.ModulePath, M.Schema, M.InputEmbedded>(
-                    inputFiles.map(i => [i.modulePath, i.schema])),
-            }))));
+            fs.writeSync(1, underlying(canonicalEncode(M.fromBundle(M.Bundle(
+                new KeyedDictionary<M.ModulePath, M.Schema, M.InputEmbedded>(
+                    inputFiles.map(i => [i.modulePath, i.schema])))))));
         } else {
             fs.writeSync(1, underlying(canonicalEncode(M.fromSchema(inputFiles[0].schema))));
         }