diff --git a/mm/Kconfig b/mm/Kconfig
index 8ac412b..40559cf 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -168,3 +168,7 @@
 	depends on QUICKLIST
 	default "2" if (SUPERH && !SUPERH64)
 	default "1"
+
+config VIRT_TO_BUS
+	def_bool y
+	depends on !ARCH_NO_VIRT_TO_BUS