diff --git a/test/powershell/Modules/Microsoft.PowerShell.Utility/Send-MailMessage.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Utility/Send-MailMessage.Tests.ps1
index 9e9a30bdfc..f996200896 100644
--- a/test/powershell/Modules/Microsoft.PowerShell.Utility/Send-MailMessage.Tests.ps1
+++ b/test/powershell/Modules/Microsoft.PowerShell.Utility/Send-MailMessage.Tests.ps1
@@ -6,7 +6,7 @@ Describe "Send-MailMessage" -Tags CI, RequireSudoOnUnix {
         Register-PackageSource -Name nuget.org -Location https://api.nuget.org/v3/index.json -ProviderName NuGet -ErrorAction SilentlyContinue
 
         $nugetPackage = "netDumbster"
-        Install-Package -Name $nugetPackage -ProviderName NuGet -Scope CurrentUser -Force
+        Install-Package -Name $nugetPackage -ProviderName NuGet -Scope CurrentUser -Force -Source 'nuget.org'
 
         $dll = "$(Split-Path (Get-Package $nugetPackage).Source)\lib\netstandard2.0\netDumbster.dll"
         Add-Type -Path $dll