diff --git a/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs b/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
index cfbb6d44413..e2c15d75d14 100644
--- a/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
+++ b/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
@@ -41,7 +41,12 @@ protected override async Task<bool> Execute (Context context)
 			// Install runtime packs associated with the SDK previously installed.
 			var packageDownloadProj = Path.Combine (BuildPaths.XamarinAndroidSourceRoot, "build-tools", "xaprepare", "xaprepare", "package-download.proj");
 			var logPath = Path.Combine (Configurables.Paths.BuildBinDir, $"msbuild-{context.BuildTimeStamp}-download-runtime-packs.binlog");
-			if (!Utilities.RunCommand (Configurables.Paths.DotNetPreviewTool, new string [] { "restore", ProcessRunner.QuoteArgument (packageDownloadProj), ProcessRunner.QuoteArgument ($"-bl:{logPath}") })) {
+			var restoreArgs = new string [] { "restore",
+				ProcessRunner.QuoteArgument (packageDownloadProj),
+				"--configfile", Path.Combine (BuildPaths.XamarinAndroidSourceRoot, "NuGet.config"),
+				ProcessRunner.QuoteArgument ($"-bl:{logPath}"),
+			};
+			if (!Utilities.RunCommand (Configurables.Paths.DotNetPreviewTool, restoreArgs)) {
 				Log.ErrorLine ($"dotnet restore {packageDownloadProj} failed.");
 				return false;
 			}
diff --git a/build-tools/xaprepare/xaprepare/Steps/Step_PrepareExternal.cs b/build-tools/xaprepare/xaprepare/Steps/Step_PrepareExternal.cs
index 398464084a2..b49a3592d65 100644
--- a/build-tools/xaprepare/xaprepare/Steps/Step_PrepareExternal.cs
+++ b/build-tools/xaprepare/xaprepare/Steps/Step_PrepareExternal.cs
@@ -25,8 +25,9 @@ protected override async Task<bool> Execute (Context context)
 				return false;
 
 			return await msbuild.Restore (
-				projectPath: Path.Combine (Configurables.Paths.ExternalXamarinAndroidToolsSln),
+				projectPath: Configurables.Paths.ExternalXamarinAndroidToolsSln,
 				logTag: "xat-restore",
+				arguments: new List<string> () { "--configfile", Path.Combine (Configurables.Paths.ExternalDir, "xamarin-android-tools", "NuGet.config") },
 				binlogName: "prepare-xat-restore"
 			);
 		}