diff --git a/packages/core-js/postinstall.js b/packages/core-js/postinstall.js
index fcb8d3cb5b93..f87a4ea52ac1 100644
--- a/packages/core-js/postinstall.js
+++ b/packages/core-js/postinstall.js
@@ -15,6 +15,7 @@ var CI = [
   'BUILD_NUMBER',
   'CI',
   'CONTINUOUS_INTEGRATION',
+  'OPEN_SOURCE_CONTRIBUTOR',
   'RUN_ID'
 ].some(function (it) { return is(env[it]); });