diff --git a/libraries/GCS_MAVLink/GCS_Common.cpp b/libraries/GCS_MAVLink/GCS_Common.cpp
index 54e9b32221..19467b91d1 100644
--- a/libraries/GCS_MAVLink/GCS_Common.cpp
+++ b/libraries/GCS_MAVLink/GCS_Common.cpp
@@ -4221,7 +4221,8 @@ void GCS_MAVLINK::send_banner()
 #define DEVID_MASK	0xFFF
     if (AP_BoardConfig::io_enabled()) {
         uint32_t mcuid = iomcu.get_mcu_id();
-        send_text(MAV_SEVERITY_INFO, "IOMCU: %x %x", uint16_t(mcuid & DEVID_MASK), uint16_t((mcuid & REVID_MASK) >> 16U));
+        send_text(MAV_SEVERITY_INFO, "IOMCU: %x %x %lx", uint16_t(mcuid & DEVID_MASK), uint16_t((mcuid & REVID_MASK) >> 16U),
+            iomcu.get_cpu_id());
     }
 #endif