diff --git a/build/build-bootstrap.ps1 b/build/build-bootstrap.ps1
index 82c789ff22..645f6c7d41 100644
--- a/build/build-bootstrap.ps1
+++ b/build/build-bootstrap.ps1
@@ -34,6 +34,7 @@
     if (-not (test-path $nuget))
     {
       Write-Host "Download NuGet..."
+	  [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
       Invoke-WebRequest $source -OutFile $nuget
       if (-not $?) { throw "Failed to download NuGet." }
     }