diff --git a/src/Renci.SshNet/PrivateKeyFile.cs b/src/Renci.SshNet/PrivateKeyFile.cs
index 414bcfcd7..23a6157f6 100644
--- a/src/Renci.SshNet/PrivateKeyFile.cs
+++ b/src/Renci.SshNet/PrivateKeyFile.cs
@@ -472,7 +472,7 @@ private void Open(Stream privateKey, string? passPhrase)
                     }
                     else
                     {
-                        throw new SshException(string.Format("Cipher method '{0}' is not supported.", cipherName));
+                        throw new SshException(string.Format("Cipher method '{0}' is not supported.", ssh2CipherName));
                     }
 
                     /*