diff --git a/.changes/api-cjs-chunks.md b/.changes/api-cjs-chunks.md
new file mode 100644
index 000000000..672e5b816
--- /dev/null
+++ b/.changes/api-cjs-chunks.md
@@ -0,0 +1,5 @@
+---
+"api": patch
+---
+
+CommonJS chunks are now properly exported with `.cjs` extension
diff --git a/tooling/api/rollup.config.js b/tooling/api/rollup.config.js
index 0790637ff..cc6c9665b 100644
--- a/tooling/api/rollup.config.js
+++ b/tooling/api/rollup.config.js
@@ -36,6 +36,7 @@ export default [
         dir: 'dist/',
         entryFileNames: '[name].cjs',
         format: 'cjs',
+        chunkFileNames: '[name]-[hash].cjs',
         exports: 'named',
         globals: {}
       },