diff --git a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ClientConfigurationDiagnosticTest.cs b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ClientConfigurationDiagnosticTest.cs
index 50636a04d6..89fbccb62d 100644
--- a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ClientConfigurationDiagnosticTest.cs
+++ b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ClientConfigurationDiagnosticTest.cs
@@ -86,6 +86,7 @@ public void ClientConfigWithOptionsTest()
 
             ClientConfigurationTraceDatum clientConfig = new ClientConfigurationTraceDatum(context, DateTime.UtcNow);
             Assert.AreEqual(clientConfig.ConsistencyConfig.ApplicationRegion, "East US");
+            Assert.IsNull(clientConfig.ConsistencyConfig.PreferredRegions);
 
         }