diff --git a/security/Kconfig b/security/Kconfig
index a623d13bf2884afdc6fdcdbe656811b7d31b2951..3d4debd0257e2544996ac97c90831bde3a854e7d 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -56,6 +56,7 @@ config SECURITY_NETWORK
 
 config PAGE_TABLE_ISOLATION
 	bool "Remove the kernel mapping in user mode"
+	default y
 	depends on X86_64 && !UML
 	help
 	  This feature reduces the number of hardware side channels by