diff --git a/samples/csharp_dotnetcore/13.core-bot.tests/Bots/DialogBotTests.cs b/samples/csharp_dotnetcore/13.core-bot.tests/Bots/DialogBotTests.cs
index 64c19200d1..5630c999ef 100644
--- a/samples/csharp_dotnetcore/13.core-bot.tests/Bots/DialogBotTests.cs
+++ b/samples/csharp_dotnetcore/13.core-bot.tests/Bots/DialogBotTests.cs
@@ -43,7 +43,7 @@ public async Task LogsInformationToILogger()
                     It.IsAny<EventId>(),
                     It.Is<object>(o => o.ToString() == "Running dialog with Message Activity."),
                     null,
-                    It.IsAny<Func<object, Exception, string>>()),
+                    (Func<object, Exception, string>)It.IsAny<object>()),
                 Times.Once);
         }