diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index ccbce37e2dd..481fe0ab448 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -2970,7 +2970,7 @@ ahciaction(struct cam_sim *sim, union ccb *ccb)
 		cpi->unit_number = cam_sim_unit(sim);
 		cpi->transport = XPORT_SATA;
 		cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
-		cpi->protocol = PROTO_UNSPECIFIED;
+		cpi->protocol = PROTO_ATA;
 		cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
 		cpi->maxio = MAXPHYS;
 		/* ATI SB600 can't handle 256 sectors with FPDMA (NCQ). */
diff --git a/sys/dev/ata/ata-all.c b/sys/dev/ata/ata-all.c
index 73e32dd749d..b1c09ab2fd0 100644
--- a/sys/dev/ata/ata-all.c
+++ b/sys/dev/ata/ata-all.c
@@ -1875,7 +1875,7 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 		else
 			cpi->transport = XPORT_ATA;
 		cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
-		cpi->protocol = PROTO_UNSPECIFIED;
+		cpi->protocol = PROTO_ATA;
 		cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
 		cpi->maxio = ch->dma.max_iosize ? ch->dma.max_iosize : DFLTPHYS;
 		if (device_get_devclass(device_get_parent(parent)) ==
diff --git a/sys/dev/mvs/mvs.c b/sys/dev/mvs/mvs.c
index 1c7c930b602..507c13f3f05 100644
--- a/sys/dev/mvs/mvs.c
+++ b/sys/dev/mvs/mvs.c
@@ -2385,7 +2385,7 @@ mvsaction(struct cam_sim *sim, union ccb *ccb)
 		cpi->unit_number = cam_sim_unit(sim);
 		cpi->transport = XPORT_SATA;
 		cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
-		cpi->protocol = PROTO_UNSPECIFIED;
+		cpi->protocol = PROTO_ATA;
 		cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
 		cpi->maxio = MAXPHYS;
 		if ((ch->quirks & MVS_Q_SOC) == 0) {
diff --git a/sys/dev/siis/siis.c b/sys/dev/siis/siis.c
index caf493a9bd0..a8a1ed22b82 100644
--- a/sys/dev/siis/siis.c
+++ b/sys/dev/siis/siis.c
@@ -1960,7 +1960,7 @@ siisaction(struct cam_sim *sim, union ccb *ccb)
 		cpi->unit_number = cam_sim_unit(sim);
 		cpi->transport = XPORT_SATA;
 		cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
-		cpi->protocol = PROTO_UNSPECIFIED;
+		cpi->protocol = PROTO_ATA;
 		cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
 		cpi->maxio = MAXPHYS;
 		cpi->hba_vendor = pci_get_vendor(parent);