diff --git a/src/DotNetty.Transport/Channels/DefaultChannelId.cs b/src/DotNetty.Transport/Channels/DefaultChannelId.cs
index 1ea5edab5..05a7e3d92 100644
--- a/src/DotNetty.Transport/Channels/DefaultChannelId.cs
+++ b/src/DotNetty.Transport/Channels/DefaultChannelId.cs
@@ -123,7 +123,7 @@ static byte[] ParseMachineId(string value)
             var machineId = new byte[MachineIdLen];
             for (int i = 0; i < value.Length; i += 2)
             {
-                machineId[i] = (byte)int.Parse(value.Substring(i, i + 2), NumberStyles.AllowHexSpecifier);
+                machineId[i] = (byte)int.Parse(value.Substring(i, 2), NumberStyles.AllowHexSpecifier);
             }
             return machineId;
         }
@@ -251,4 +251,4 @@ public override bool Equals(object obj)
 
         public override string ToString() => this.AsShortText();
     }
-}
\ No newline at end of file
+}