diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 5472c2401876..271e654d852d 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -256,7 +256,7 @@ static void __init free_unused_memmap(void)
  */
 void __init mem_init(void)
 {
-	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
+	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
 
 #ifndef CONFIG_SPARSEMEM_VMEMMAP
 	free_unused_memmap();