diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 16b32153b5..7e5204866b 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -34,7 +34,7 @@ do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0)
 #define SENSE_HARDWARE_ERROR  4
 #define SENSE_ILLEGAL_REQUEST 5
 
-#define SCSI_DMA_BUF_SIZE    65536
+#define SCSI_DMA_BUF_SIZE    131072
 
 typedef struct SCSIRequest {
     SCSIDeviceState *dev;