diff --git a/src/Microsoft.IdentityModel.Protocols.OpenIdConnect/Json/OpenIdConnectConfigurationSerializer.cs b/src/Microsoft.IdentityModel.Protocols.OpenIdConnect/Json/OpenIdConnectConfigurationSerializer.cs
index 3cbf4c7003..fc877effad 100644
--- a/src/Microsoft.IdentityModel.Protocols.OpenIdConnect/Json/OpenIdConnectConfigurationSerializer.cs
+++ b/src/Microsoft.IdentityModel.Protocols.OpenIdConnect/Json/OpenIdConnectConfigurationSerializer.cs
@@ -30,7 +30,7 @@ internal static class OpenIdConnectConfigurationSerializer
         {
             "ACR_VALUES_SUPPORTED",
             "AUTHORIZATION_ENDPOINT",
-            "AUTHORIZATION_RESPONSE_ISS_PARAMETER_SUPPORTED"
+            "AUTHORIZATION_RESPONSE_ISS_PARAMETER_SUPPORTED",
             "BACKCHANNEL_AUTHENTICATION_ENDPOINT",
             "BACKCHANNEL_AUTHENTICATION_REQUEST_SIGNING_ALG_VALUES_SUPPORTED",
             "BACKCHANNEL_TOKEN_DELIVERY_MODES_SUPPORTED",