diff --git a/mm/bootmem.c b/mm/bootmem.c
index 0131170c9d540a572c7b2ba3108ca5c2d9db30b7..67872fca97d962ade7a772caad9c1db17d59df51 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -203,6 +203,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
 		} else {
 			unsigned long off = 0;
 
+			vec >>= start & (BITS_PER_LONG - 1);
 			while (vec && off < BITS_PER_LONG) {
 				if (vec & 1) {
 					page = pfn_to_page(start + off);