diff --git a/src/Conventions/DiagnosticLogger.cs b/src/Conventions/DiagnosticLogger.cs
index 293fa5ecf..a64a0c914 100644
--- a/src/Conventions/DiagnosticLogger.cs
+++ b/src/Conventions/DiagnosticLogger.cs
@@ -29,7 +29,7 @@ public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Except
             _diagnosticSource.Write(GetName(logLevel), new
             {
                 eventId,
-                state,
+                state = (object)state,
                 exception,
                 message = formatter(state, exception)
             });