diff --git a/test/HealthChecks.Publisher.CloudWatch.Tests/DependencyInjection/RegistrationTests.cs b/test/HealthChecks.Publisher.CloudWatch.Tests/DependencyInjection/RegistrationTests.cs
index 2b9ef3d75a..7952d43987 100644
--- a/test/HealthChecks.Publisher.CloudWatch.Tests/DependencyInjection/RegistrationTests.cs
+++ b/test/HealthChecks.Publisher.CloudWatch.Tests/DependencyInjection/RegistrationTests.cs
@@ -8,7 +8,7 @@ public void add_healthcheck_when_properly_configured_with_default_parameter()
         var services = new ServiceCollection();
         services
             .AddHealthChecks()
-            .AddCloudWatchPublisher();
+            .AddCloudWatchPublisher(options => options.Region = Amazon.RegionEndpoint.USEast1);
 
         using var serviceProvider = services.BuildServiceProvider();
         var publisher = serviceProvider.GetService<IHealthCheckPublisher>();
@@ -22,7 +22,11 @@ public void add_healthcheck_when_properly_configured_with_custom_service_check_n
         var services = new ServiceCollection();
         services
             .AddHealthChecks()
-            .AddCloudWatchPublisher(options => options.ServiceCheckName = "serviceCheckName");
+            .AddCloudWatchPublisher(options =>
+            {
+                options.ServiceCheckName = "serviceCheckName";
+                options.Region = Amazon.RegionEndpoint.USEast1;
+            });
 
         using var serviceProvider = services.BuildServiceProvider();
         var publisher = serviceProvider.GetService<IHealthCheckPublisher>();