diff --git a/libraries/AP_HAL_ChibiOS/Util.cpp b/libraries/AP_HAL_ChibiOS/Util.cpp
index 51b98cf3b32..af58bf0a7d8 100644
--- a/libraries/AP_HAL_ChibiOS/Util.cpp
+++ b/libraries/AP_HAL_ChibiOS/Util.cpp
@@ -253,3 +253,10 @@ bool Util::get_system_id(char buf[40])
     buf[39] = 0;
     return true;
 }
+
+bool Util::get_system_id_unformatted(uint8_t buf[], uint8_t &len)
+{
+    len = MIN(12, len);
+    memcpy(buf, (const void *)UDID_START, len);
+    return true;
+}
diff --git a/libraries/AP_HAL_ChibiOS/Util.h b/libraries/AP_HAL_ChibiOS/Util.h
index 8ce16487dcc..068d3a14dd2 100644
--- a/libraries/AP_HAL_ChibiOS/Util.h
+++ b/libraries/AP_HAL_ChibiOS/Util.h
@@ -44,7 +44,8 @@ public:
 
     // get system ID as a string
     bool get_system_id(char buf[40]) override;
-    
+    bool get_system_id_unformatted(uint8_t buf[], uint8_t &len) override;
+
 #ifdef HAL_PWM_ALARM
     bool toneAlarm_init() override;
     void toneAlarm_set_buzzer_tone(float frequency, float volume, uint32_t duration_ms) override;