diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index 46747d7a2b67..5c194e905cdf 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -2580,7 +2580,7 @@ ahci_setup_fis(struct ahci_channel *ch, struct ahci_cmd_tab *ctp, union ccb *ccb
 		fis[11] = ccb->ataio.cmd.features_exp;
 		fis[12] = ccb->ataio.cmd.sector_count;
 		if (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA) {
-			fis[12] &= 0xf8;
+			fis[12] &= 0x07;
 			fis[12] |= tag << 3;
 		}
 		fis[13] = ccb->ataio.cmd.sector_count_exp;
diff --git a/sys/dev/siis/siis.c b/sys/dev/siis/siis.c
index 245ec22a94e1..c9d98527c783 100644
--- a/sys/dev/siis/siis.c
+++ b/sys/dev/siis/siis.c
@@ -1725,7 +1725,7 @@ siis_setup_fis(device_t dev, struct siis_cmd *ctp, union ccb *ccb, int tag)
 		fis[11] = ccb->ataio.cmd.features_exp;
 		fis[12] = ccb->ataio.cmd.sector_count;
 		if (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA) {
-			fis[12] &= 0xf8;
+			fis[12] &= 0x03;
 			fis[12] |= tag << 3;
 		}
 		fis[13] = ccb->ataio.cmd.sector_count_exp;