diff --git a/bazel/api-golden/index_npm_packages.ts b/bazel/api-golden/index_npm_packages.ts
index 405dee955..10b8de378 100644
--- a/bazel/api-golden/index_npm_packages.ts
+++ b/bazel/api-golden/index_npm_packages.ts
@@ -70,6 +70,7 @@ async function main(
     // Keep track of outdated goldens.
     if (actual !== expected) {
       if (approveGolden) {
+        fs.mkdirSync(path.dirname(goldenFilePath), {recursive: true});
         fs.writeFileSync(goldenFilePath, actual, 'utf8');
       } else {
         outdatedGoldens.push(goldenName);