diff --git a/src/libraries/Microsoft.Extensions.Logging.EventSource/tests/EventSourceLoggerTest.cs b/src/libraries/Microsoft.Extensions.Logging.EventSource/tests/EventSourceLoggerTest.cs
index 6c4543c05d4fb..6a54f4f5e43b2 100644
--- a/src/libraries/Microsoft.Extensions.Logging.EventSource/tests/EventSourceLoggerTest.cs
+++ b/src/libraries/Microsoft.Extensions.Logging.EventSource/tests/EventSourceLoggerTest.cs
@@ -7,6 +7,7 @@
 using System.Globalization;
 using System.IO;
 using System.Linq;
+using System.Text.Json;
 using Microsoft.Extensions.Logging.EventSource;
 using Xunit;
 using Microsoft.Extensions.DependencyInjection;
@@ -954,7 +955,7 @@ private static class EventTypes
             { "OuterScopeStop", (e) => VerifySingleEvent(e, "Logger1", EventTypes.ActivityStop, null, null, null) },
 
             { "InnerScopeJsonStart", (e) => VerifySingleEvent(e, "Logger3", EventTypes.ActivityJsonStart, null, null, null,
-                        @"""ArgumentsJson"":{""timeParam"":""" + TimeParam.ToString() + @""",""guidParam"":""" + GuidParam.ToString("D")) },
+                        @"""ArgumentsJson"":{""timeParam"":""" + JsonEncodedText.Encode(TimeParam.ToString()).ToString() + @""",""guidParam"":""" + GuidParam.ToString("D")) },
             { "InnerScopeJsonStop", (e) => VerifySingleEvent(e, "Logger3", EventTypes.ActivityJsonStop, null, null, null) },
 
             { "InnerScopeStart", (e) => VerifySingleEvent(e, "Logger3", EventTypes.ActivityStart, null, null, null) },