diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 009120f88b..b696c6291a 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -1151,7 +1151,7 @@ static void process_ncq_command(AHCIState *s, int port, uint8_t *cmd_fis,
     if (!ncq_tfs->sector_count) {
         ncq_tfs->sector_count = 0x10000;
     }
-    size = ncq_tfs->sector_count * 512;
+    size = ncq_tfs->sector_count * BDRV_SECTOR_SIZE;
     ahci_populate_sglist(ad, &ncq_tfs->sglist, ncq_tfs->cmdh, size, 0);
 
     if (ncq_tfs->sglist.size < size) {
@@ -1703,7 +1703,8 @@ static int ahci_state_post_load(void *opaque, int version_id)
                 return -1;
             }
             ahci_populate_sglist(ncq_tfs->drive, &ncq_tfs->sglist,
-                                 ncq_tfs->cmdh, ncq_tfs->sector_count * 512,
+                                 ncq_tfs->cmdh,
+                                 ncq_tfs->sector_count * BDRV_SECTOR_SIZE,
                                  0);
             if (ncq_tfs->sector_count != ncq_tfs->sglist.size >> 9) {
                 return -1;