diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c
index 1ce32261b55292c0c6262449623631b310e775c9..499c1465aec993764e0fe35989af5213329a917e 100644
--- a/hw/scsi/mptsas.c
+++ b/hw/scsi/mptsas.c
@@ -824,7 +824,7 @@ static uint32_t mptsas_doorbell_read(MPTSASState *s)
 {
     uint32_t ret;
 
-    ret = (s->who_init << MPI_DOORBELL_WHO_INIT_SHIFT) & MPI_DOORBELL_WHO_INIT_SHIFT;
+    ret = (s->who_init << MPI_DOORBELL_WHO_INIT_SHIFT) & MPI_DOORBELL_WHO_INIT_MASK;
     ret |= s->state;
     switch (s->doorbell_state) {
     case DOORBELL_NONE: