diff --git a/lib/Kconfig b/lib/Kconfig
index 334f7722a999232aa46b706d8cda61b57c854708..a8a775730c09c27c4da8188cf84cc5e6c7608fe0 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -451,7 +451,8 @@ config MPILIB
 
 config SIGNATURE
 	tristate
-	depends on KEYS && CRYPTO
+	depends on KEYS
+	select CRYPTO
 	select CRYPTO_SHA1
 	select MPILIB
 	help