diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Swan-K1/defaults.parm b/libraries/AP_HAL_ChibiOS/hwdef/Swan-K1/defaults.parm
index dfa0339319..81d86a66b6 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Swan-K1/defaults.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Swan-K1/defaults.parm
@@ -14,6 +14,9 @@ SERVO3_FUNCTION 35
 SERVO4_FUNCTION 36
 Q_OPTIONS 128
 
+#Second IMU seems to give better results on this board
+EK3_PRIMARY 1
+
 # RC input is SBUS on serial4 TX pin
 SERIAL4_PROTOCOL 23
 SERIAL4_OPTIONS 8