diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index a26b20b19e994b4a059c95f1b8b2beb60f41efa4..5affc82d2b55692ba6fc4c5d7b23b548a7e981e7 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -1870,8 +1870,7 @@ static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val)
             int shift;
             n = (offset - 0x58) >> 2;
             shift = (offset & 3) * 8;
-            s->scratch[n] &= ~(0xff << shift);
-            s->scratch[n] |= (val & 0xff) << shift;
+            s->scratch[n] = deposit32(s->scratch[n], shift, 8, val);
         } else {
             BADF("Unhandled writeb 0x%x = 0x%x\n", offset, val);
         }