diff --git a/src/mono/wasm/Wasm.Build.Tests/Common/RunCommand.cs b/src/mono/wasm/Wasm.Build.Tests/Common/RunCommand.cs
index b13b6011de265..5ab27489622ae 100644
--- a/src/mono/wasm/Wasm.Build.Tests/Common/RunCommand.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/Common/RunCommand.cs
@@ -11,7 +11,7 @@ public class RunCommand : DotNetCommand
     public RunCommand(BuildEnvironment buildEnv, ITestOutputHelper _testOutput, string label="") : base(buildEnv, _testOutput, false, label)
     {
         WithEnvironmentVariables(buildEnv.EnvVars);
-        WithEnvironmentVariable("DOTNET_ROOT", buildEnv.DotNet);
+        WithEnvironmentVariable("DOTNET_ROOT", Path.GetDirectoryName(buildEnv.DotNet)!);
         WithEnvironmentVariable("DOTNET_INSTALL_DIR", Path.GetDirectoryName(buildEnv.DotNet)!);
         WithEnvironmentVariable("DOTNET_MULTILEVEL_LOOKUP", "0");
         WithEnvironmentVariable("DOTNET_SKIP_FIRST_TIME_EXPERIENCE", "1");