diff --git a/ArduCopter/config.h b/ArduCopter/config.h
index 180e720cbb..99cfed5176 100644
--- a/ArduCopter/config.h
+++ b/ArduCopter/config.h
@@ -58,7 +58,6 @@
 #if CONFIG_HAL_BOARD == HAL_BOARD_APM2
  # define CONFIG_IMU_TYPE   CONFIG_IMU_MPU6000
  # define CONFIG_PUSHBUTTON DISABLED
- # define CONFIG_RELAY      DISABLED
  # define CONFIG_SONAR_SOURCE SONAR_SOURCE_ANALOG_PIN
  # define MAGNETOMETER ENABLED
  # ifdef APM2_BETA_HARDWARE
@@ -70,14 +69,12 @@
 #elif CONFIG_HAL_BOARD == HAL_BOARD_AVR_SITL
  # define CONFIG_IMU_TYPE   CONFIG_IMU_SITL
  # define CONFIG_PUSHBUTTON DISABLED
- # define CONFIG_RELAY      DISABLED
  # define CONFIG_SONAR_SOURCE SONAR_SOURCE_ANALOG_PIN
  # define MAGNETOMETER ENABLED
 #elif CONFIG_HAL_BOARD == HAL_BOARD_PX4
  # define CONFIG_IMU_TYPE   CONFIG_IMU_PX4
  # define CONFIG_BARO       AP_BARO_PX4
  # define CONFIG_PUSHBUTTON DISABLED
- # define CONFIG_RELAY      DISABLED
  # define CONFIG_SONAR_SOURCE SONAR_SOURCE_ANALOG_PIN
  # define MAGNETOMETER ENABLED
 #elif CONFIG_HAL_BOARD == HAL_BOARD_SMACCM
@@ -86,7 +83,6 @@
  # define CONFIG_MS5611_SERIAL AP_BARO_MS5611_I2C
  # define CONFIG_ADC        DISABLED
  # define CONFIG_PUSHBUTTON DISABLED
- # define CONFIG_RELAY      DISABLED
  # define CONFIG_SONAR_SOURCE SONAR_SOURCE_ANALOG_PIN
  # define MAGNETOMETER ENABLED
 #endif
@@ -253,10 +249,6 @@
  # define CONFIG_PUSHBUTTON ENABLED
 #endif
 
-#ifndef CONFIG_RELAY
- # define CONFIG_RELAY ENABLED
-#endif
-
 //////////////////////////////////////////////////////////////////////////////
 // Barometer
 //