diff --git a/sys/dev/nvme/nvme_qpair.c b/sys/dev/nvme/nvme_qpair.c
--- a/sys/dev/nvme/nvme_qpair.c
+++ b/sys/dev/nvme/nvme_qpair.c
@@ -563,7 +563,7 @@
 	 * will be in a list pointed to by the command (prp2).
 	 */
 	prpsz = sizeof(uint64_t) *
-	    howmany(ctrlr->max_xfer_size, ctrlr->page_size);
+	    (howmany(ctrlr->max_xfer_size, ctrlr->page_size) + 1);
 	prpmemsz = qpair->num_trackers * prpsz;
 	allocsz = cmdsz + cplsz + prpmemsz;