diff --git a/sys/dev/nvme/nvme_ctrlr.c b/sys/dev/nvme/nvme_ctrlr.c
--- a/sys/dev/nvme/nvme_ctrlr.c
+++ b/sys/dev/nvme/nvme_ctrlr.c
@@ -1312,8 +1312,8 @@
 				ret = EFAULT;
 				goto err;
 			}
-			req = nvme_allocate_request_vaddr(buf->b_data, pt->len,
-			    M_WAITOK, nvme_pt_done, pt);
+			req = nvme_allocate_request_buf(buf, M_WAITOK,
+			    nvme_pt_done, pt);
 		} else
 			req = nvme_allocate_request_vaddr(pt->buf, pt->len,
 			    M_WAITOK, nvme_pt_done, pt);
@@ -1409,8 +1409,8 @@
 				ret = EFAULT;
 				goto err;
 			}
-			req = nvme_allocate_request_vaddr(buf->b_data,
-			    npc->data_len, M_WAITOK, nvme_npc_done, npc);
+			req = nvme_allocate_request_buf(buf, M_WAITOK,
+			    nvme_npc_done, npc);
 		} else
 			req = nvme_allocate_request_vaddr(
 			    (void *)(uintptr_t)npc->addr, npc->data_len,