diff --git a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat
index 6d0a9bb870..3bab50781e 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat
@@ -139,3 +139,6 @@ define HAL_I2C_CLEAR_BUS
 
 env DEFINES CONFIG_HAL_BOARD_SUBTYPE='HAL_BOARD_SUBTYPE_CHIBIOS_SKYVIPER_F412'
 env DEFAULT_PARAMETERS 'Tools/Frame_params/SkyViper-F412/defaults.parm'
+
+# the web UI uses an abin file for firmware uploads
+env BUILD_ABIN True
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
index 173cd2680c..4fd09727f2 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
@@ -58,3 +58,6 @@ undef PA1
 PA1 UART4_RX UART4 NODMA
 
 env DEFAULT_PARAMETERS 'Tools/Frame_params/SkyViper-2450GPS/defaults.parm'
+
+# the web UI uses an abin file for firmware uploads
+env BUILD_ABIN True