diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/TestCommand.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/TestCommand.cs
index a82872429..c25fcd533 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/TestCommand.cs
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/TestCommand.cs
@@ -145,6 +145,17 @@ namespace Microsoft.DotNet.Tools.Test.Utilities
             psi.Environment["DOTNET_MULTILEVEL_LOOKUP"] = "0";
             psi.Environment["DOTNET_SKIP_FIRST_TIME_EXPERIENCE"] = "1";
 
+            // Set DOTNET_ROOT to ensure sub process find the same host fxr
+            string dotnetDirectoryPath = Path.GetDirectoryName(RepoDirectoriesProvider.DotnetUnderTest);
+            if (System.Environment.Is64BitProcess)
+            {
+                psi.Environment.Add("DOTNET_ROOT", dotnetDirectoryPath);
+            }
+            else
+            {
+                psi.Environment.Add("DOTNET_ROOT(x86)", dotnetDirectoryPath);
+            }
+
             AddEnvironmentVariablesTo(psi);
 
             AddWorkingDirectoryTo(psi);