diff --git a/experimental/packages/otlp-transformer/package.json b/experimental/packages/otlp-transformer/package.json
index 540c5af84f..d25813a328 100644
--- a/experimental/packages/otlp-transformer/package.json
+++ b/experimental/packages/otlp-transformer/package.json
@@ -38,6 +38,12 @@
     "node": ">=8.12.0"
   },
   "files": [
+    "build/esm/**/*.js",
+    "build/esm/**/*.js.map",
+    "build/esm/**/*.d.ts",
+    "build/esnext/**/*.js",
+    "build/esnext/**/*.js.map",
+    "build/esnext/**/*.d.ts",
     "build/src/**/*.js",
     "build/src/**/*.js.map",
     "build/src/**/*.d.ts",