diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index 71f759a..eb9828d 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -927,13 +927,18 @@
     assert(len > 0 && len <= LSI_MAX_MSGIN_LEN);
     if (len > s->dbc)
         len = s->dbc;
-    pci_dma_write(PCI_DEVICE(s), s->dnad, s->msg, len);
-    /* Linux drivers rely on the last byte being in the SIDL.  */
-    s->sidl = s->msg[len - 1];
-    s->msg_len -= len;
-    if (s->msg_len) {
-        memmove(s->msg, s->msg + len, s->msg_len);
-    } else {
+
+    if (len) {
+        pci_dma_write(PCI_DEVICE(s), s->dnad, s->msg, len);
+        /* Linux drivers rely on the last byte being in the SIDL.  */
+        s->sidl = s->msg[len - 1];
+        s->msg_len -= len;
+        if (s->msg_len) {
+            memmove(s->msg, s->msg + len, s->msg_len);
+        }
+    }
+
+    if (!s->msg_len) {
         /* ??? Check if ATN (not yet implemented) is asserted and maybe
            switch to PHASE_MO.  */
         switch (s->msg_action) {