diff --git a/Tools/AP_Periph/can.cpp b/Tools/AP_Periph/can.cpp
index 6ae3c8e2cf..43972a15d0 100644
--- a/Tools/AP_Periph/can.cpp
+++ b/Tools/AP_Periph/can.cpp
@@ -1600,7 +1600,7 @@ void AP_Periph_FW::hwesc_telem_update()
     const HWESC_Telem::HWESC &t = hwesc_telem.get_telem();
 
     uavcan_equipment_esc_Status pkt {};
-    pkt.esc_index = g.esc_number;
+    pkt.esc_index = g.esc_number[0]; // only supports a single ESC
     pkt.voltage = t.voltage;
     pkt.current = t.current;
     pkt.temperature = C_TO_KELVIN(MAX(t.mos_temperature, t.cap_temperature));