diff --git a/src/TL.cs b/src/TL.cs
index 0cb701c..3e79102 100644
--- a/src/TL.cs
+++ b/src/TL.cs
@@ -185,10 +185,13 @@ namespace TL
 		}
 
 		internal static void WriteTLStamp(this BinaryWriter writer, DateTime datetime)
-			=> writer.Write((uint)(datetime.ToUniversalTime().Ticks / 10000000 - 62135596800L));
+			=> writer.Write(datetime == DateTime.MaxValue ? int.MaxValue : (int)(datetime.ToUniversalTime().Ticks / 10000000 - 62135596800L));
 
 		internal static DateTime ReadTLStamp(this BinaryReader reader)
-			=> new((reader.ReadUInt32() + 62135596800L) * 10000000, DateTimeKind.Utc);
+		{
+			int unixstamp = reader.ReadInt32();
+			return unixstamp == int.MaxValue ? DateTime.MaxValue : new((unixstamp + 62135596800L) * 10000000, DateTimeKind.Utc);
+		}
 
 		internal static void WriteTLString(this BinaryWriter writer, string str)
 		{