diff --git a/src/tests/baseservices/RuntimeConfiguration/TestConfigTester.csproj b/src/tests/baseservices/RuntimeConfiguration/TestConfigTester.csproj
index cd6cb09525e455..48615f4ec48a93 100644
--- a/src/tests/baseservices/RuntimeConfiguration/TestConfigTester.csproj
+++ b/src/tests/baseservices/RuntimeConfiguration/TestConfigTester.csproj
@@ -1,5 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
+    <!-- Needed for GCStressIncompatible and others -->
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <!-- This test provides no interesting scenarios for GCStress -->
     <GCStressIncompatible>true</GCStressIncompatible>
     <UnloadabilityIncompatible>true</UnloadabilityIncompatible>