diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
index d8f44c89c6..c5a51f0a6b 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
@@ -74,6 +74,24 @@ PF4  BMI055_G_CS CS
 PG10 BMI055_A_CS CS
 PF5  FRAM_CS CS SPEED_VERYLOW
 
+# I2C buses
+
+PB8 I2C1_SCL I2C1
+PB9 I2C1_SDA I2C1
+
+PF1 I2C2_SCL I2C2
+PF0 I2C2_SDA I2C2
+
+PH7 I2C3_SCL I2C3
+PH8 I2C3_SDA I2C3
+
+#PF14 I2C4_SCK I2C4
+#PF15 I2C4_SDA I2C4
+
+# order of I2C buses
+I2C_ORDER I2C2 I2C1 I2C3
+
+
 # enable pins
 PE3 VDD_3V3_SENSORS_EN OUTPUT HIGH
 PF12 nVDD_5V_HIPOWER_EN OUTPUT LOW