diff --git a/stdlib/Pkg/src/PlatformEngines.jl b/stdlib/Pkg/src/PlatformEngines.jl
index 8fb430d146be8..736ccccb0ea67 100644
--- a/stdlib/Pkg/src/PlatformEngines.jl
+++ b/stdlib/Pkg/src/PlatformEngines.jl
@@ -199,6 +199,8 @@ function probe_platform_engines!(;verbose::Bool = false)
                 [System.Net.ServicePointManager]::SecurityProtocol =
                     [System.Net.SecurityProtocolType]::Tls12;
                 \$webclient = (New-Object System.Net.Webclient);
+                \$webclient.UseDefaultCredentials = \$true;
+                \$webclient.Proxy.Credentials = \$webclient.Credentials;
                 \$webclient.Headers.Add("user-agent", \"Pkg.jl (https://github.com/JuliaLang/Pkg.jl)\");
                 \$webclient.DownloadFile(\"$url\", \"$path\")
                 """