diff --git a/index.js b/index.js
index 6770f21..0a8ceb8 100644
--- a/index.js
+++ b/index.js
@@ -335,6 +335,8 @@ pip3 install -U virtualenv && ${runPy}
   postinstall(dir, libDir, funcRuntime) {
     if (!this.dockerizedPip) {
       return BbPromise.resolve()
+    } else if (os.platform() === 'win32') {
+        return BbPromise.resolve()
     }
     const cmd = (() => {
       const userInfo = os.userInfo();