diff --git a/src/scsi/scsi_aha154x.c b/src/scsi/scsi_aha154x.c
index 4cc7f5ca7..b51fd98ac 100644
--- a/src/scsi/scsi_aha154x.c
+++ b/src/scsi/scsi_aha154x.c
@@ -396,10 +396,12 @@ typedef struct {
 
     int		ResetCB;
 
+    volatile uint8_t				/* for multi-threading, keep */
+		Status,				/* these volatile */
+		Interrupt;
+
     int		ExtendedLUNCCBFormat;
     Req_t	Req;
-    uint8_t	Status;
-    uint8_t	Interrupt;
     uint8_t	Geometry;
     uint8_t	Control;
     uint8_t	Command;
diff --git a/src/scsi/scsi_buslogic.c b/src/scsi/scsi_buslogic.c
index e8a637427..6f15815cc 100644
--- a/src/scsi/scsi_buslogic.c
+++ b/src/scsi/scsi_buslogic.c
@@ -10,7 +10,7 @@
  *		  0 - BT-545C ISA;
  *		  1 - BT-958D PCI (but BT-545C ISA on non-PCI machines)
  *
- * Version:	@(#)scsi_buslogic.c	1.0.11	2017/09/01
+ * Version:	@(#)scsi_buslogic.c	1.0.12	2017/09/05
  *
  * Authors:	TheCollector1995, <mariogplayer@gmail.com>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -470,8 +470,9 @@ typedef struct {
     int		ExtendedLUNCCBFormat;
     HALocalRAM	LocalRAM;
     Req_t Req;
-    uint8_t	Status;
-    uint8_t	Interrupt;
+    volatile uint8_t				/* for multi-threading, keep */
+		Status,				/* these volatile */
+		Interrupt;
     uint8_t	Geometry;
     uint8_t	Control;
     uint8_t	Command;