diff --git a/src/Compat.cs b/src/Compat.cs
index 6ac6344..5835e06 100644
--- a/src/Compat.cs
+++ b/src/Compat.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
@@ -61,14 +62,13 @@ namespace WTelegram
 			return new IPEndPoint(IPAddress.Parse(addr[0..colon]), int.Parse(addr[(colon + 1)..]));
 		}
 
-		private static readonly byte[] PemStart = new byte[] { 0x30, 0x82, 0x01, 0x0A, 0x02, 0x82, 0x01, 0x01 };
 		internal static void ImportFromPem(this RSA rsa, string pem)
 		{
 			var header = pem.IndexOf("-----BEGIN RSA PUBLIC KEY-----");
 			var footer = pem.IndexOf("-----END RSA PUBLIC KEY-----");
 			if (header == -1 || footer <= header) throw new ArgumentException("Invalid RSA Public Key");
 			byte[] bytes = System.Convert.FromBase64String(pem[(header+30)..footer]);
-			if (bytes.Length != 270 || !bytes.Take(8).SequenceEqual(PemStart) || bytes[265] != 0x02 || bytes[266] != 0x03)
+			if (bytes.Length != 270 || BinaryPrimitives.ReadInt64BigEndian(bytes) != 0x3082010A02820101 || bytes[265] != 0x02 || bytes[266] != 0x03)
 				throw new ArgumentException("Unrecognized sequence in RSA Public Key");
 			rsa.ImportParameters(new RSAParameters { Modulus = bytes[8..265], Exponent = bytes[267..270] });
 		}