diff --git a/SteamTrade/SteamWeb.cs b/SteamTrade/SteamWeb.cs
index 806a13038..cb70989df 100644
--- a/SteamTrade/SteamWeb.cs
+++ b/SteamTrade/SteamWeb.cs
@@ -195,8 +195,8 @@ public bool DoLogin(string username, string password)
             RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
             RSAParameters rsaParameters = new RSAParameters
             {
-                Exponent = HexToByte(rsaJson.publickey_exp),
-                Modulus = HexToByte(rsaJson.publickey_mod)
+                Exponent = HexToByte(rsaJson.publickey_exp.ToUpper()),
+                Modulus = HexToByte(rsaJson.publickey_mod.ToUpper())
             };
 
             rsa.ImportParameters(rsaParameters);