diff --git a/crypto/Kconfig b/crypto/Kconfig
index f07d923..1e2f39c 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -33,7 +33,7 @@
 	  cbc(aes).
 
 config CRYPTO_HMAC
-	bool "HMAC support"
+	tristate "HMAC support"
 	select CRYPTO_HASH
 	help
 	  HMAC: Keyed-Hashing for Message Authentication (RFC2104).