diff --git a/src/commands/bundle.ts b/src/commands/bundle.ts
index b9eba5a5f2a..1ec94769440 100644
--- a/src/commands/bundle.ts
+++ b/src/commands/bundle.ts
@@ -57,7 +57,7 @@ export default class Bundle extends Command {
       }
 
       if (format === '.json') {
-        await writeFile(path.resolve(process.cwd(), output), document.json(), {
+        await writeFile(path.resolve(process.cwd(), output), document.string(), {
           encoding: 'utf-8',
         });
       }
diff --git a/test/commands/bundle/bundle.test.ts b/test/commands/bundle/bundle.test.ts
index 870a1d590cb..170a0819be8 100644
--- a/test/commands/bundle/bundle.test.ts
+++ b/test/commands/bundle/bundle.test.ts
@@ -25,6 +25,20 @@ describe('bundle', () => {
       done();
     });
 
+  test
+    .stdout()
+    .command([
+      'bundle', './test/commands/bundle/first-asyncapi.yaml',
+      '--output=./test/commands/bundle/final.json'
+    ])
+    .it('should successfully bundle specification into json file', (ctx, done) => {
+      expect(ctx.stdout).toContain(
+        'Check out your shiny new bundled files at ./test/commands/bundle/final.json'
+      );
+      fileCleanup('./test/commands/bundle/final.json');
+      done();
+    });
+
   test
     .stderr()
     .command([