diff --git a/packages/build_package.js b/packages/build_package.js
index bb0b074d01..c45edc77ad 100755
--- a/packages/build_package.js
+++ b/packages/build_package.js
@@ -120,7 +120,7 @@ if (!args.some(arg => arg === '--no-cleanup')) {
   for (const file of package.files)
     await copyToPackage(path.join(ROOT_PATH, file), path.join(packagePath, file));
 
-  await copyToPackage(path.join(ROOT_PATH, 'docs/api.md'), path.join(packagePath, 'api.md'));
+  await copyToPackage(path.join(ROOT_PATH, 'docs/api.json'), path.join(packagePath, 'api.json'));
   await copyToPackage(path.join(ROOT_PATH, 'src/protocol/protocol.yml'), path.join(packagePath, 'protocol.yml'));
 
   // 4. Generate package.json