diff --git a/sys/cam/cam_ccb.h b/sys/cam/cam_ccb.h
index fc59ff5d8f9..4b9b8e6c882 100644
--- a/sys/cam/cam_ccb.h
+++ b/sys/cam/cam_ccb.h
@@ -207,6 +207,9 @@ typedef enum {
 	XPT_NVME_IO		= 0x1c | XPT_FC_DEV_QUEUED,
 				/* Execiute the requestred NVMe I/O operation */
 
+	XPT_MMCSD_IO		= 0x1d | XPT_FC_DEV_QUEUED,
+				/* Placeholder for MMC / SD / SDIO I/O stuff */
+
 	XPT_SCAN_TGT		= 0x1E | XPT_FC_QUEUED | XPT_FC_USER_CCB
 				       | XPT_FC_XPT_ONLY,
 				/* Scan Target */
diff --git a/sys/cam/cam_xpt.c b/sys/cam/cam_xpt.c
index cbdf0521403..58ea13a55e8 100644
--- a/sys/cam/cam_xpt.c
+++ b/sys/cam/cam_xpt.c
@@ -5362,6 +5362,7 @@ static struct kv map[] = {
 	{ XPT_GET_SIM_KNOB, "XPT_GET_SIM_KNOB" },
 	{ XPT_SET_SIM_KNOB, "XPT_SET_SIM_KNOB" },
 	{ XPT_NVME_IO, "XPT_NVME_IO" },
+	{ XPT_MMCSD_IO, "XPT_MMCSD_IO" },
 	{ XPT_SMP_IO, "XPT_SMP_IO" },
 	{ XPT_SCAN_TGT, "XPT_SCAN_TGT" },
 	{ XPT_ENG_INQ, "XPT_ENG_INQ" },