diff --git a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
index 5fa964884e..79e3fc7b6b 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
@@ -221,4 +221,7 @@ define AP_BOOTLOADER_FLASHING_ENABLED 0
 define AC_PAYLOAD_PLACE_ENABLED 0
 define AP_MISSION_NAV_PAYLOAD_PLACE_ENABLED 0
 
+# don't need so many servo outputs (~850 bytes!)
+define NUM_SERVO_CHANNELS 15
+
 AUTOBUILD_TARGETS Copter