diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
index 0da5fa66bf..4929a1ea45 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
@@ -3313,6 +3313,9 @@ def add_iomcu_firmware_defaults(f):
 // disable some protocols on iomcu:
 #define AP_RCPROTOCOL_FASTSBUS_ENABLED 0
 
+// no crossfire telemetry from iomcu!
+#define HAL_CRSF_TELEM_ENABLED 0
+
 // end IOMCU Firmware defaults
 ''')