diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index f0e5cabe49d8..dc3b1f7e1451 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -92,7 +92,7 @@ static int __init allocate_cachealigned_memnodemap(void)
 
 	pad = L1_CACHE_BYTES - 1;
 	pad_addr = 0x8000;
-	nodemap_size = pad + memnodemapsize;
+	nodemap_size = pad + sizeof(s16) * memnodemapsize;
 	nodemap_addr = find_e820_area(pad_addr, end_pfn<<PAGE_SHIFT,
 				      nodemap_size);
 	if (nodemap_addr == -1UL) {