diff --git a/mm/Kconfig b/mm/Kconfig
index 086af70..8618722 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -163,6 +163,10 @@
 	default "0" if !ZONE_DMA
 	default "1"
 
+config BOUNCE
+	def_bool y
+	depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)
+
 config NR_QUICK
 	int
 	depends on QUICKLIST