diff --git a/src/Grpc.Net.Client/Internal/GrpcProtocolConstants.cs b/src/Grpc.Net.Client/Internal/GrpcProtocolConstants.cs
index b0e8593b7..9171a9c99 100644
--- a/src/Grpc.Net.Client/Internal/GrpcProtocolConstants.cs
+++ b/src/Grpc.Net.Client/Internal/GrpcProtocolConstants.cs
@@ -84,12 +84,12 @@ internal static string GetMessageAcceptEncoding(Dictionary<string, ICompressionP
 #endif
     }
 
-    public const string MethodKey = "Method";
-    public const string ChannelKey = "Channel";
-    public const string RequestKey = "Request";
-
     public static IEnumerator<KeyValuePair<string, object>> GetDebugEnumerator(ChannelBase channel, IMethod method, object? request)
     {
+        const string MethodKey = "Method";
+        const string ChannelKey = "Channel";
+        const string RequestKey = "Request";
+
         yield return new KeyValuePair<string, object>(ChannelKey, channel);
         yield return new KeyValuePair<string, object>(MethodKey, method);
         if (request != null)