diff --git a/src/Mvc/Mvc.ApiExplorer/src/EndpointMetadataApiDescriptionProvider.cs b/src/Mvc/Mvc.ApiExplorer/src/EndpointMetadataApiDescriptionProvider.cs
index 317b03867c09..175c35fb0567 100644
--- a/src/Mvc/Mvc.ApiExplorer/src/EndpointMetadataApiDescriptionProvider.cs
+++ b/src/Mvc/Mvc.ApiExplorer/src/EndpointMetadataApiDescriptionProvider.cs
@@ -33,7 +33,7 @@ public EndpointMetadataApiDescriptionProvider(
         EndpointDataSource endpointDataSource,
         IHostEnvironment environment,
         ParameterPolicyFactory parameterPolicyFactory,
-        IServiceProviderIsService? serviceProviderIsService)
+        IServiceProviderIsService? serviceProviderIsService = null)
     {
         _endpointDataSource = endpointDataSource;
         _environment = environment;