diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat
index b72bba09cb..7a9028c45a 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat
@@ -47,7 +47,7 @@ PA6 SPI1_MISO SPI1
 PA7 SPI1_MOSI SPI1
 
 PA9 VBUS INPUT
-PA10 FRSKY_INV OUTPUT
+PA10 FRSKY_INV OUTPUT GPIO(78)
 
 PA11 OTG_FS_DM OTG1
 PA12 OTG_FS_DP OTG1