diff --git a/build/build-bootstrap.ps1 b/build/build-bootstrap.ps1
index 71a25bfd7e..82c789ff22 100644
--- a/build/build-bootstrap.ps1
+++ b/build/build-bootstrap.ps1
@@ -22,6 +22,8 @@
   # get NuGet
   $cache = 4
   $nuget = "$scriptTemp\nuget.exe"
+  # ensure the correct NuGet-source is used. This one is used by Umbraco
+  $nugetsourceUmbraco = "https://www.myget.org/F/umbracocore/api/v3/index.json"
   if (-not $local)
   {
     $source = "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe"
@@ -61,7 +63,7 @@
   # get the build system
   if (-not $local)
   {
-    $params = "-OutputDirectory", $scriptTemp, "-Verbosity", "quiet", "-PreRelease"
+    $params = "-OutputDirectory", $scriptTemp, "-Verbosity", "quiet", "-PreRelease", "-Source", $nugetsourceUmbraco
     &$nuget install Umbraco.Build @params
     if (-not $?) { throw "Failed to download Umbraco.Build." }
   }
diff --git a/build/build.ps1 b/build/build.ps1
index ea07e4516f..6e124d1508 100644
--- a/build/build.ps1
+++ b/build/build.ps1
@@ -375,11 +375,14 @@
 
   })
 
+  $nugetsourceUmbraco = "https://api.nuget.org/v3/index.json"
+
   $ubuild.DefineMethod("RestoreNuGet",
   {
     Write-Host "Restore NuGet"
     Write-Host "Logging to $($this.BuildTemp)\nuget.restore.log"
-    &$this.BuildEnv.NuGet restore "$($this.SolutionRoot)\src\Umbraco.sln" > "$($this.BuildTemp)\nuget.restore.log"
+	$params = "-Source", $nugetsourceUmbraco   
+    &$this.BuildEnv.NuGet restore "$($this.SolutionRoot)\src\Umbraco.sln" > "$($this.BuildTemp)\nuget.restore.log" @params
     if (-not $?) { throw "Failed to restore NuGet packages." }
   })