diff --git a/libraries/AP_HAL_ChibiOS/hwdef/mRoControlZeroF7/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/mRoControlZeroF7/hwdef.dat
index 04026e39fe..38c67adc98 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/mRoControlZeroF7/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/mRoControlZeroF7/hwdef.dat
@@ -62,6 +62,9 @@ define HAL_GPIO_SPEKTRUM_RC 71
 # Order of I2C buses
 I2C_ORDER I2C1
 
+# this board only has a single I2C bus so make it external
+define HAL_I2C_INTERNAL_MASK 0
+
 # OEM Only
 # I2C_ORDER I2C1, I2C2, I2C3