diff --git a/npm/install.js b/npm/install.js
index cf9d57037a0..02868ce9a9d 100755
--- a/npm/install.js
+++ b/npm/install.js
@@ -16,7 +16,7 @@ try {
   // do nothing
 }
 
-var platform = os.platform()
+var platform = process.env.npm_config_platform
 
 function onerror (err) {
   throw err