diff --git a/mm/Kconfig b/mm/Kconfig
index 17b8947..e4a33b9 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -115,6 +115,10 @@
 config SPARSEMEM_VMEMMAP_ENABLE
 	bool
 
+config SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+	def_bool y
+	depends on SPARSEMEM && X86_64
+
 config SPARSEMEM_VMEMMAP
 	bool "Sparse Memory virtual memmap"
 	depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE