diff --git a/packages/puppeteer-core/package.json b/packages/puppeteer-core/package.json
index c487bad7..da87ca09 100644
--- a/packages/puppeteer-core/package.json
+++ b/packages/puppeteer-core/package.json
@@ -134,6 +134,7 @@
       "files": [
         "src/**",
         "compat/**",
+        "third_party/**",
         "**/tsconfig.*.json"
       ],
       "output": [