diff --git a/headers/private/drivers/scsi_cmds.h b/headers/private/drivers/scsi_cmds.h
index 73ebfe839e..3231029175 100644
--- a/headers/private/drivers/scsi_cmds.h
+++ b/headers/private/drivers/scsi_cmds.h
@@ -122,7 +122,7 @@
 #define SCSIS_ASC_REMOVAL_REQUESTED 0x5a01	// operator requests medium removal
 
 // some scsi op-codes
-#define	SCSI_OP_TUR 0x00
+#define	SCSI_OP_TEST_UNIT_READY 0x00
 #define SCSI_OP_REQUEST_SENSE 0x03
 #define SCSI_OP_FORMAT 0x04
 #define	SCSI_OP_READ_6 0x08
diff --git a/src/add-ons/kernel/bus_managers/ide/scsi2ata.c b/src/add-ons/kernel/bus_managers/ide/scsi2ata.c
index 85d68d450e..618e95c610 100644
--- a/src/add-ons/kernel/bus_managers/ide/scsi2ata.c
+++ b/src/add-ons/kernel/bus_managers/ide/scsi2ata.c
@@ -396,7 +396,7 @@ ata_exec_io(ide_device_info *device, ide_qrequest *qrequest)
 		start_request(device, qrequest);
 
 	switch (request->cdb[0]) {
-		case SCSI_OP_TUR:
+		case SCSI_OP_TEST_UNIT_READY:
 			ata_test_unit_ready(device, qrequest);
 			break;
 
diff --git a/src/add-ons/kernel/bus_managers/scsi/device_scan.c b/src/add-ons/kernel/bus_managers/scsi/device_scan.c
index 525ff2ac27..92a7e390fd 100644
--- a/src/add-ons/kernel/bus_managers/scsi/device_scan.c
+++ b/src/add-ons/kernel/bus_managers/scsi/device_scan.c
@@ -31,7 +31,7 @@ scsi_scan_send_tur(scsi_ccb *worker_req)
 	SHOW_FLOW0( 3, "" );
 	
 	memset( cmd, 0, sizeof( *cmd ));
-	cmd->opcode = SCSI_OP_TUR;
+	cmd->opcode = SCSI_OP_TEST_UNIT_READY;
 	
 	worker_req->sg_list = NULL;
 	worker_req->data = NULL;
diff --git a/src/add-ons/kernel/generic/scsi_periph/removable.c b/src/add-ons/kernel/generic/scsi_periph/removable.c
index 23e0aabf5a..1dc1b4b328 100644
--- a/src/add-ons/kernel/generic/scsi_periph/removable.c
+++ b/src/add-ons/kernel/generic/scsi_periph/removable.c
@@ -98,7 +98,7 @@ send_tur(scsi_periph_device_info *device, scsi_ccb *request)
 	request->sg_list = NULL;
 
 	memset(cmd, 0, sizeof(*cmd));
-	cmd->opcode = SCSI_OP_TUR;
+	cmd->opcode = SCSI_OP_TEST_UNIT_READY;
 
 	request->cdb_length = sizeof(*cmd);