diff --git a/src/Paramore.Brighter.Outbox.Sqlite/SqliteOutbox.cs b/src/Paramore.Brighter.Outbox.Sqlite/SqliteOutbox.cs
index 1fe9c232d6..07fa25864d 100644
--- a/src/Paramore.Brighter.Outbox.Sqlite/SqliteOutbox.cs
+++ b/src/Paramore.Brighter.Outbox.Sqlite/SqliteOutbox.cs
@@ -27,6 +27,7 @@ THE SOFTWARE. */
 using System.Collections.Generic;
 using System.Data;
 using System.Data.Common;
+using System.Globalization;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
@@ -258,7 +259,7 @@ protected override IDbDataParameter[] InitAddDbParameters(Message message, int?
                 {
                     ParameterName = $"@{prefix}Timestamp",
                     SqliteType = SqliteType.Text,
-                    Value = message.Header.TimeStamp.ToString("s")
+                    Value = message.Header.TimeStamp.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture)
                 },
                 new SqliteParameter
                 {