diff --git a/tools/bootstrap/node_.ps1 b/tools/bootstrap/node_.ps1
index 22379f61f91..91be4e07a3d 100644
--- a/tools/bootstrap/node_.ps1
+++ b/tools/bootstrap/node_.ps1
@@ -1,3 +1,5 @@
+#Requires -Version 4.0
+
 # bootstrap/node_.ps1
 #
 # Node bootstrapping script for Windows.