diff --git a/crypto/Kconfig b/crypto/Kconfig
index 306738c..fa927a2 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -165,6 +165,21 @@
 	  See also:
 	  <http://www.schneier.com/twofish.html>
 
+config CRYPTO_TWOFISH_X86_64
+	tristate "Twofish cipher algorithm (x86_64)"
+	depends on CRYPTO && ((X86 || UML_X86) && 64BIT)
+	select CRYPTO_TWOFISH_COMMON
+	help
+	  Twofish cipher algorithm (x86_64).
+
+	  Twofish was submitted as an AES (Advanced Encryption Standard)
+	  candidate cipher by researchers at CounterPane Systems.  It is a
+	  16 round block cipher supporting key sizes of 128, 192, and 256
+	  bits.
+
+	  See also:
+	  <http://www.schneier.com/twofish.html>
+
 config CRYPTO_SERPENT
 	tristate "Serpent cipher algorithm"
 	depends on CRYPTO