diff --git a/libraries/AP_HAL_PX4/RCOutput.cpp b/libraries/AP_HAL_PX4/RCOutput.cpp
index a7c9ec268a..76484f6a4a 100644
--- a/libraries/AP_HAL_PX4/RCOutput.cpp
+++ b/libraries/AP_HAL_PX4/RCOutput.cpp
@@ -26,11 +26,9 @@ void PX4RCOutput::init(void* unused)
     if (ioctl(_pwm_fd, PWM_SERVO_ARM, 0) != 0) {
         hal.console->printf("RCOutput: Unable to setup IO arming\n");
     }
-#ifdef PWM_SERVO_SET_ARM_OK
     if (ioctl(_pwm_fd, PWM_SERVO_SET_ARM_OK, 0) != 0) {
         hal.console->printf("RCOutput: Unable to setup IO arming OK\n");
     }
-#endif
     _rate_mask = 0;
     _alt_fd = -1;    
     _servo_count = 0;