diff --git a/nuttx/configs/px4fmuv2/include/board.h b/nuttx/configs/px4fmuv2/include/board.h
index 5eae244772..8158e618da 100755
--- a/nuttx/configs/px4fmuv2/include/board.h
+++ b/nuttx/configs/px4fmuv2/include/board.h
@@ -311,7 +311,7 @@
  */
 #define TONE_ALARM_TIMER	2	/* timer 2 */
 #define TONE_ALARM_CHANNEL	1	/* channel 1 */
-#define GPIO_TONE_ALARM		(GPIO_ALT|GPIO_AF2|GPIO_SPEED_2MHz|GPIO_PULLUP|GPIO_PUSHPULL|GPIO_PORTA|GPIO_PIN15)
+#define GPIO_TONE_ALARM		(GPIO_ALT|GPIO_AF1|GPIO_SPEED_2MHz|GPIO_FLOAT|GPIO_PUSHPULL|GPIO_PORTA|GPIO_PIN15)
 
 /************************************************************************************
  * Public Data