diff --git a/libraries/AP_HAL/board/empty.h b/libraries/AP_HAL/board/empty.h
index 78aa976de6..f1198d75fa 100644
--- a/libraries/AP_HAL/board/empty.h
+++ b/libraries/AP_HAL/board/empty.h
@@ -10,3 +10,4 @@
 #define CONFIG_HAL_BOARD_SUBTYPE HAL_BOARD_SUBTYPE_NONE
 
 #define HAL_HAVE_BOARD_VOLTAGE 1
+#define HAL_HAVE_SAFETY_SWITCH 1
diff --git a/libraries/AP_HAL/board/linux.h b/libraries/AP_HAL/board/linux.h
index b9d3d193bc..09ee40a5a1 100644
--- a/libraries/AP_HAL/board/linux.h
+++ b/libraries/AP_HAL/board/linux.h
@@ -350,3 +350,4 @@
 #endif
 
 #define HAL_HAVE_BOARD_VOLTAGE 1
+#define HAL_HAVE_SAFETY_SWITCH 1
diff --git a/libraries/AP_HAL/board/px4.h b/libraries/AP_HAL/board/px4.h
index c3b3085b7c..49b29e1b47 100644
--- a/libraries/AP_HAL/board/px4.h
+++ b/libraries/AP_HAL/board/px4.h
@@ -89,7 +89,9 @@
 #define HAL_COMPASS_IST8310_I2C_ADDR 0x0E
 #define HAL_COMPASS_IST8310_I2C_BUS 1
 #define HAL_SERIAL0_BAUD_DEFAULT 460800
+
 #define HAL_HAVE_BOARD_VOLTAGE 0
+#define HAL_HAVE_SAFETY_SWITCH 0
 #define HAL_PX4_HAVE_MTD_SUPPORT 0
 #define HAL_PX4_HAVE_PX4IO 0
 #endif
@@ -110,3 +112,7 @@
 #ifndef HAL_PX4_HAVE_PX4IO
 #define HAL_PX4_HAVE_PX4IO 1
 #endif
+
+#ifndef HAL_HAVE_SAFETY_SWITCH
+#define HAL_HAVE_SAFETY_SWITCH 1
+#endif
diff --git a/libraries/AP_HAL/board/qurt.h b/libraries/AP_HAL/board/qurt.h
index 45c63914bd..a83221f41a 100644
--- a/libraries/AP_HAL/board/qurt.h
+++ b/libraries/AP_HAL/board/qurt.h
@@ -14,3 +14,4 @@
 #define HAL_SERIAL0_BAUD_DEFAULT 115200
 
 #define HAL_HAVE_BOARD_VOLTAGE 1
+#define HAL_HAVE_SAFETY_SWITCH 1
diff --git a/libraries/AP_HAL/board/sitl.h b/libraries/AP_HAL/board/sitl.h
index 3fa2cccd34..b5f5d4fb7d 100644
--- a/libraries/AP_HAL/board/sitl.h
+++ b/libraries/AP_HAL/board/sitl.h
@@ -19,3 +19,4 @@
 #define HAL_GPIO_LED_OFF          HIGH
 
 #define HAL_HAVE_BOARD_VOLTAGE 1
+#define HAL_HAVE_SAFETY_SWITCH 1
diff --git a/libraries/AP_HAL/board/vrbrain.h b/libraries/AP_HAL/board/vrbrain.h
index 32c94e0a7c..1ad7d91a9b 100644
--- a/libraries/AP_HAL/board/vrbrain.h
+++ b/libraries/AP_HAL/board/vrbrain.h
@@ -45,4 +45,5 @@
 #define EXTERNAL_LED_MOTOR2       31    // Motor2 LED - AN12
 
 #define HAL_HAVE_BOARD_VOLTAGE 0
+#define HAL_HAVE_SAFETY_SWITCH 1
 #define HAL_PX4_HAVE_MTD_SUPPORT 1